<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>Search results for 'tag:Prefixes tag:Consonants' matching tags 'Prefixes' and 'Consonants'</title><link>http://www.englishforums.com/search/pro.htm?q=tag%3aPrefixes+tag%3aConsonants&amp;tag=Prefixes,Consonants&amp;orTags=0</link><description>Search results for 'tag:Prefixes tag:Consonants' matching tags 'Prefixes' and 'Consonants'</description><dc:language>en-US</dc:language><generator>CSMOD (Build: 3170.31378)</generator><item><title>Re: Words with double consonants</title><link>http://www.englishforums.com/English/WordsWithDoubleConsonants/ghdkx/post.htm#536568</link><pubDate>Fri, 04 Jul 2008 07:52:28 GMT</pubDate><guid isPermaLink="true">946f00bb-57d3-4b7b-a9a2-059b5341af52:536568</guid><dc:creator>CalifJim</dc:creator><description>&lt;BLOCKQUOTE&gt;&lt;div&gt;&lt;img src="/Themes/englishforums/images/icon-quote.gif"&gt; &lt;strong&gt;Matsko&lt;/strong&gt;&lt;/div&gt;&lt;div&gt;I am aware that its one M&lt;/div&gt;&lt;/BLOCKQUOTE&gt; No.&amp;nbsp; It&amp;#39;s two &lt;b&gt;m&lt;/b&gt;&amp;#39;s.&lt;/p&gt;&lt;p&gt;There is no general rule.&lt;/p&gt;&lt;p&gt;&lt;i&gt;panel&lt;/i&gt; has one &lt;b&gt;n&lt;/b&gt;.&amp;nbsp; &lt;i&gt;flannel&lt;/i&gt; has two &lt;b&gt;n&lt;/b&gt;&amp;#39;s.&amp;nbsp; These rhyming words should both take the same pattern!&amp;nbsp;&lt;/p&gt;&lt;p&gt;The least often doubled are &lt;i&gt;h, j, k, q, v, w, x, y&lt;/i&gt;.&amp;nbsp; It would be a rare word that contained a doubling of one of these consonants.&lt;/p&gt;&lt;p&gt;In the case of Latinate verbs, doubling is a little more predictable.&amp;nbsp; Many of these consist of a prefix (or two) and a root.&amp;nbsp; Unfortunately, you have to have a good knowledge, or at least a good intuition, about Latin prefixes and roots.&amp;nbsp; All in all, it is probably not worth the trouble to learn all the rules. &lt;/p&gt;&lt;p&gt;Nevertheless, it may be instructive to examine a few cases.&lt;/p&gt;&lt;p&gt;Prefixes:&amp;nbsp; &lt;font color="#ff6600"&gt;re&lt;/font&gt;, &lt;font color="#0000ff"&gt;com&lt;/font&gt;.&amp;nbsp; Root: &lt;font color="#008080"&gt;mend&lt;/font&gt;.&amp;nbsp; &lt;font color="#ff6600"&gt;re&lt;/font&gt;&lt;font color="#0000ff"&gt;com&lt;/font&gt;&lt;font color="#008080"&gt;mend  &lt;font color="#000000"&gt;You need one &lt;b&gt;m&lt;/b&gt; for the prefix &lt;i&gt;com&lt;/i&gt; and another &lt;b&gt;m&lt;/b&gt; for the root &lt;i&gt;mend&lt;/i&gt;.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt;&lt;p&gt;Prefixes:&amp;nbsp; &lt;font color="#ff6600"&gt;de&lt;/font&gt;, &lt;font color="#0000ff"&gt;con&lt;/font&gt;.&amp;nbsp; Root: &lt;font color="#008080"&gt;struct&lt;/font&gt;.&amp;nbsp; &lt;font color="#ff6600"&gt;de&lt;/font&gt;&lt;font color="#0000ff"&gt;con&lt;/font&gt;&lt;font color="#008080"&gt;struct&lt;/font&gt;&amp;nbsp; No doubling required.&amp;nbsp;&lt;/p&gt;&lt;p&gt;Prefixes:&amp;nbsp; &lt;font color="#ff6600"&gt;dis&lt;/font&gt;, &lt;font color="#0000ff"&gt;con&lt;/font&gt;&amp;nbsp; Root:&amp;nbsp; &lt;font color="#008080"&gt;nect&lt;/font&gt; &amp;nbsp; &amp;nbsp; &lt;font color="#ff6600"&gt;dis&lt;/font&gt;&lt;font color="#0000ff"&gt;con&lt;/font&gt;&lt;font color="#008080"&gt;nect&lt;/font&gt;&amp;nbsp; One &lt;b&gt;n&lt;/b&gt; for the prefix; another &lt;b&gt;n&lt;/b&gt; for the root.&amp;nbsp;&lt;/p&gt;&lt;p&gt;Prefix:&amp;nbsp; &lt;font color="#ff6600"&gt;op&lt;/font&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;&amp;nbsp; Root: &lt;font color="#008080"&gt;pose &amp;nbsp; &amp;nbsp;&lt;/font&gt; &lt;font color="#ff6600"&gt;op&lt;/font&gt;&lt;font color="#008080"&gt;pose&lt;/font&gt;&amp;nbsp; One &lt;b&gt;p&lt;/b&gt; for the prefix; another &lt;b&gt;p&lt;/b&gt; for the root.&lt;br /&gt;&lt;/p&gt;&lt;p&gt;Prefix:&amp;nbsp; &lt;font color="#ff6600"&gt;im&lt;/font&gt; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp; Root: &lt;font color="#008080"&gt;merse&lt;/font&gt; &amp;nbsp; &lt;font color="#ff6600"&gt;im&lt;/font&gt;&lt;font color="#008080"&gt;merse&lt;/font&gt;&amp;nbsp; One &lt;b&gt;m&lt;/b&gt; for the prefix; another for the root. &lt;br /&gt;&lt;/p&gt;&lt;p&gt;Prefixes:&amp;nbsp; &lt;font color="#ff6600"&gt;ac, &lt;font color="#0000ff"&gt;com&lt;/font&gt;&lt;/font&gt; &amp;nbsp; Root: &lt;font color="#008080"&gt;mod&amp;nbsp; &lt;font color="#000000"&gt;Suffix:&amp;nbsp; ate&lt;/font&gt;&lt;/font&gt; &amp;nbsp; &lt;font color="#ff6600"&gt;ac&lt;font color="#0000ff"&gt;com&lt;/font&gt;&lt;/font&gt;&lt;font color="#008080"&gt;mod&lt;font color="#000000"&gt;ate&lt;/font&gt;&lt;/font&gt;&amp;nbsp; One &lt;b&gt;c&lt;/b&gt; for the first prefix; one for the next prefix.&amp;nbsp; One &lt;b&gt;m&lt;/b&gt; for the second prefix; another for the root. &lt;br /&gt;&lt;/p&gt;&lt;p&gt;Watch for these related groups of prefixes that are associated with doubled consonants: &lt;/p&gt;&lt;p&gt;col, cor, com, con; il, ir, im; op, oc, of; sup, suf; ac, af, ag, al, an, ap, ar, as, at&lt;/p&gt;&lt;p&gt;collect, correct, commend, connect, illegal, irregular, immerse, oppose, occur, offer, suppose, suffer, accede, affect, aggregate, allay, announce, approve, arrange, assault, attract.&lt;/p&gt;&lt;p&gt;There is no prefix am or om before m.&amp;nbsp; These are reduced to a and o, so there is no doubling:&amp;nbsp; amend, omit.&amp;nbsp; The same applies to av and ov.&amp;nbsp; avoid, overt.&lt;/p&gt;&lt;p&gt;Don&amp;#39;t confuse the Latinate ac, af, ag, etc. with the &amp;quot;native English&amp;quot; prefix a, which connects with &amp;quot;native English&amp;quot; roots:&amp;nbsp; awake, asleep, ago, awry, about, around,&amp;nbsp; aloud, ... These never have doubling.&lt;/p&gt;&lt;p&gt;These comments just give a rough idea of a few of the sorts of ideas that underlie the patterns of doubled consonants in English.&amp;nbsp;&lt;/p&gt;&lt;p&gt;CJ&amp;nbsp;&lt;/p&gt;&lt;p&gt;&lt;br /&gt;&lt;/p&gt;&lt;p&gt;&amp;nbsp;</description></item><item><title>Re: The sound of &amp;quot;S&amp;quot; at the beginning and in the middle of words</title><link>http://www.englishforums.com/English/SoundBeginningMiddleWords/clpvg/post.htm#225494</link><pubDate>Mon, 15 May 2006 07:05:55 GMT</pubDate><guid isPermaLink="true">946f00bb-57d3-4b7b-a9a2-059b5341af52:225494</guid><dc:creator>CalifJim</dc:creator><description>I don't know of a site like that.&lt;br&gt;

&lt;br&gt;

Initial &lt;i&gt;s&lt;/i&gt; is pronounced /s/, except in &lt;i&gt;sure&lt;/i&gt; and &lt;i&gt;sugar&lt;/i&gt;, where it is pronounced /S/*.&lt;br&gt;

Medial &lt;i&gt;s&lt;/i&gt; is problematic.&amp;nbsp; There are no hard-and-fast rules -- mostly just lists.&lt;br&gt;

In -ssion or -ssure, the double S is /S/.&amp;nbsp; impression, pressure&lt;br&gt;

In -sion or -sure, the S is /Z/*. vision, treasure&lt;br&gt;

*/S/ is the sound of "sh" in "sheep". /Z/ is the sound of "s" in "measure" or of "zh" in "Zhivago".&lt;br&gt;

&lt;br&gt;
Otherwise âssâ has the sound /s/.&amp;nbsp;
Exceptions where âssâ = /z/ are âAussie, Missouri, dessert, dissolve,
scissorsâ, and the first âssâ of âpossessionâ&lt;br&gt;

&lt;br&gt;

âscâ before âeâ, âiâ or âyâ acts as if âssâ.
(acquiesce)&amp;nbsp; Otherwise, âscâ is
/sk/.&amp;nbsp; (ascot, Oscar)&lt;br&gt;

&lt;br&gt;

Intervocalic ârsâ, âlsâ, and ânsâ.&amp;nbsp; The âsâ is /s/.&amp;nbsp; (horse,
else, density, dorsal, conversation, pulse,&amp;nbsp;
pensive)&lt;br&gt;
But when followed by final âyâ or âeyâ the tendency in this
situation is for âsâ to be /z/.&amp;nbsp;
(Mersey, Jersey, pansy, tansy, palsy)&amp;nbsp; Unusual cases with three
intervocalic consonants.&amp;nbsp; parsley (/s/), Guernsey (/z/).&lt;br&gt;

Intervocalic âspâ, âstâ*, âskâ.&amp;nbsp; The âsâ is /s/.&amp;nbsp; (aspen,
mustard, asking, prosper, hostile, askew)&lt;br&gt;

&lt;br&gt;

*But after a stressed vowel, final âstleâ and âstenâ have a
silent âtâ, and âsâ is /s/.&amp;nbsp; (castle,
rustle, hasten)&amp;nbsp; Stated differently, in
such contexts âstâ has the sound of âssâ.&amp;nbsp;
An exception is âpestleâ, which may be pronounced with or without the
/t/.&lt;br&gt;

&lt;br&gt;

Intervocalic âsmâ, âsnâ, âslâ, âsbâ, âsdâ, âsgâ.&amp;nbsp; The âsâ is /z/.&amp;nbsp;
(Osmond, osmium, cosmic, Asner, Maslow, Cosby, wisdom, Disney,
frisbie, dismal, paisley)&amp;nbsp; But not in
compounds: (busboy, gaslight)&amp;nbsp; &lt;br&gt;

&lt;br&gt;

Final
â-ismâ has /z/.&lt;br&gt;

&lt;br&gt;

Intervocalic âsâ is typically /z/, but it is /s/ often
enough to require memorizing the many exceptions.&amp;nbsp; Note below how the same spellings can be /s/ or /z/, depending on
the word or even the use of the word (noun or verb).&lt;br&gt;

&lt;br&gt;

With /s/: case, base, chase, vase,
erase&lt;br&gt;

With
/z/:&amp;nbsp; phase, phrase, laser, quasar&lt;br&gt;

With
/s/: obese&lt;br&gt;

With /z/:&amp;nbsp; these, Chinese, Japanese, and all
"nationality words" in "-ese"&lt;br&gt;

With
/s/:&amp;nbsp; vise, isolate, isobar, and all words with prefix âiso-â.&lt;br&gt;

With /z/:&amp;nbsp; rise, wise, arise, advise, supervise,
improvise, all &lt;i&gt;prefix&lt;/i&gt; + âvise" words, advertise, prison&lt;br&gt;

With
/s/:&amp;nbsp; dose, close (adj), verbose,
morose, purpose, monstrosity, porosity&lt;br&gt;

With /z/:&amp;nbsp; chose, hose, close (v), nose, pose, prose,
rose, those; lose, whose; position&lt;br&gt;

With
/s/&amp;nbsp;: obtuse, recluse; use, abuse, excuse
(nouns)&lt;br&gt;

With /z/:&amp;nbsp; muse, fuse, ruse, amuse, accuse, profuse,
confuse; use, abuse, excuse (verbs)&lt;br&gt;

With
/z/: raise, praise, braise, raisin, daisy&lt;br&gt;

With /s/: geese, Reese&lt;br&gt;

With /z/: cheese&lt;br&gt;

With /s/:&amp;nbsp; cease, crease, grease*, lease&lt;br&gt;

With /z/: tease, ease, please;
easel, teasel, weasel; reason, season, treason&lt;br&gt;

With /s/: mouse, louse, grouse,
douse (v), house (n)&lt;br&gt;

With /z/: rouse, arouse, carouse;
house (v), lousy; browse, drowse, drowsy&lt;br&gt;

With /s/: moose, goose, loose,
noose, caboose&lt;br&gt;

With /z/: choose&lt;br&gt;

*âgreaseâ has /s/ in the northern
U.S. and /z/ in the southern U.S.&lt;br&gt;

&lt;br&gt;

Prefix + root.&lt;br&gt;

&lt;br&gt;

With the prefix âtransâ it often makes no difference whether
/s/ or /z/ is used.&lt;br&gt;

Speakers vary in their choices.&lt;br&gt;

/s/
or /z/:&amp;nbsp; transpire, transpose, transmit,
transact&lt;br&gt;

Latin prefixes âreâ, âdeâ, âpreâ followed by a root
beginning with âsâ (and vowel) normally have&amp;nbsp;
/z/.&lt;br&gt;

reserve, deserve, preserve, resort, present, design, resign,
resent, resemble, resolve&lt;br&gt;

But with /s/:&amp;nbsp;
resource, research; reset, resend, all âre-â meaning âagainâ.&lt;br&gt;

But Anglo prefixes âbeâ, âaâ followed by a root beginning
with âsâ (and vowel) have /s/.&lt;br&gt;

beset, asea, beseech, aside, beside, besiege, asunder&lt;br&gt;

&lt;br&gt;

CJ</description></item><item><title>Re: How and where to use negative prefixes like un-,dis,non-,etc?</title><link>http://www.englishforums.com/English/NegativePrefixes/2/bpccg/Post.htm#157834</link><pubDate>Sat, 12 Nov 2005 16:17:09 GMT</pubDate><guid isPermaLink="true">946f00bb-57d3-4b7b-a9a2-059b5341af52:157834</guid><dc:creator>Klavier</dc:creator><description>&lt;BLOCKQUOTE&gt;&lt;table width="85%"&gt;&lt;tr&gt;&lt;td class="txt4"&gt;&lt;img src="/Themes/default/images/icon-quote.gif"&gt;&amp;nbsp;&lt;strong&gt;Anonymous wrote:&lt;/strong&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td class="quoteTable"&gt;&lt;table width="100%"&gt;&lt;tr&gt;&lt;td width="100%" valign="top" class="txt4"&gt;&lt;p&gt;Hi, freak guy,&lt;/p&gt;
&lt;p&gt;otherwise You would not ferer the poor guy to long lists of words to memorise by heart or to practical usage ONLY.&lt;/p&gt;
&lt;p&gt;Have a nice sleep in Your den&lt;/p&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/BLOCKQUOTE&gt;&lt;br&gt;
So, should I learn ancient roots, rules, and which consonant and vowels
go here and there ? Should I burn my brain with this stuff when it
comes to the prefix &lt;i&gt;retro-&lt;/i&gt; for example, or is it more
'PRACTICAL' to learn all the words in the dictionary in this pattern?
Please allow me: retroactive - retrograde - retrospect - retrospective.
Oh! I think I have already learnt them. &lt;br&gt;
Have a nice sleep in Your monastery.&lt;br&gt;</description></item><item><title>Re: How and where to use negative prefixes like un-,dis,non-,etc?</title><link>http://www.englishforums.com/English/NegativePrefixes/2/bxwjr/Post.htm#154768</link><pubDate>Thu, 03 Nov 2005 14:46:05 GMT</pubDate><guid isPermaLink="true">946f00bb-57d3-4b7b-a9a2-059b5341af52:154768</guid><dc:creator>Anonymous</dc:creator><description>&lt;P&gt;Hi, freak guy,&lt;/P&gt;
&lt;P&gt;of course, there are very strict rules, but these rules are rooted in ancient LAtin, if You do not know Latin, then You can claim there are no rules. But if You are not educated enought, You should not state such a nonsense. There are rules as to what consonants or vowels must precede to add this or that prefix. Have you ever heard of a progressive assimilation, for example? You do not seem to have, otherwise You would not ferer the poor guy to long lists of words to memorise by heart or to practical usage ONLY.&lt;/P&gt;
&lt;P&gt;Have a nice sleep in Your den&lt;/P&gt;
&lt;P&gt;Yours Zdenek&lt;/P&gt;</description></item><item><title>Re: prefix</title><link>http://www.englishforums.com/English/Prefix/bmhmx/post.htm#144718</link><pubDate>Wed, 05 Oct 2005 06:48:18 GMT</pubDate><guid isPermaLink="true">946f00bb-57d3-4b7b-a9a2-059b5341af52:144718</guid><dc:creator>rvw</dc:creator><description>There are many rules governing the writing of compounds, and many
exceptions to the rules.&amp;nbsp; I would say that you should always first
consult a good dictionary to see if the compound has an established
form.&amp;nbsp; From &lt;i&gt;Webster's Third New International Dictionary&lt;/i&gt;, here are &lt;b&gt;some&lt;/b&gt; of the rules governing prefixes:&lt;br&gt;
&lt;br&gt;
1. &lt;b&gt;Prefixes in borrowed compounds.&lt;/b&gt;&amp;nbsp; A hyphen is often used between duplicated vowels:&amp;nbsp; &lt;i&gt;co-operate&lt;/i&gt;, but usually the form is solid:&amp;nbsp; &lt;i&gt;cooperate&lt;/i&gt;. If the letters (vowels or consonants) are different, the word is usually solid:&amp;nbsp; &lt;i&gt;coalesce, coerce, collect, diagram, anarchy&lt;/i&gt;.&lt;br&gt;
&lt;br&gt;
2. &lt;b&gt;Prefixes in compounds formed within English.&lt;/b&gt;&amp;nbsp; Open styling is usually &lt;i&gt;not&lt;/i&gt; used. "Some combinations are usually close-styled (&lt;i&gt;in-&lt;/i&gt; and &lt;i&gt;un-&lt;/i&gt;, as in&lt;i&gt; inexpressible, untenable&lt;/i&gt;), some are usually hyphened (&lt;i&gt;ex&lt;/i&gt;- in &lt;i&gt;ex-president&lt;/i&gt;), some are frequently styled either way (&lt;i&gt;anti-, co-, extra, non-, pre-, semi-&lt;/i&gt;)."&amp;nbsp; Hyphens are used to avoid vowel duplications:&amp;nbsp; &lt;i&gt;anti-intellectualism&lt;/i&gt;. Hyphens are less common if the vowels are different:&amp;nbsp; &lt;i&gt;deadjectival, foreoath&lt;/i&gt;. Solid styling is usual for junctures with consonants:&amp;nbsp; &lt;i&gt;nonmetallic, nonalcoholic, extralegal.&lt;br&gt;
&lt;br&gt;
&lt;/i&gt;3. "When the base word begins with a capital, a hyphen is usual: &lt;i&gt;un-American&lt;/i&gt;."&lt;br&gt;
&lt;br&gt;
4. Some "prefixes" function as adjectives when they are open before a noun:&amp;nbsp; &lt;i&gt;a pseudo liberal, quasi independence&lt;/i&gt;.&lt;br&gt;
&lt;br&gt;
5.&amp;nbsp; Sometimes, the hyphened word has a different etymology, pronunciation, and meaning:&amp;nbsp; &lt;br&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp; r&lt;i&gt;ecover&lt;/i&gt;:&amp;nbsp; to get back&lt;br&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp; &lt;i&gt;re-cover&lt;/i&gt;:&amp;nbsp; to cover again.&lt;br&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp; &lt;i&gt;recreation&lt;/i&gt;:&amp;nbsp; play.&lt;br&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp; &lt;i&gt;re-creation&lt;/i&gt;:&amp;nbsp; a creating again.&lt;br&gt;
&lt;br&gt;</description></item><item><title>Re: How and where to use negative prefixes like un-,dis,non-,etc?</title><link>http://www.englishforums.com/English/NegativePrefixes/wzvc/post.htm#40819</link><pubDate>Wed, 04 Aug 2004 20:53:30 GMT</pubDate><guid isPermaLink="true">946f00bb-57d3-4b7b-a9a2-059b5341af52:40819</guid><dc:creator>CalifJim</dc:creator><description>There is no rule.  Words with these prefixes have come about through accidents of history.  The most usual is "un-", but always consult a dictionary.  The following does not really answer your question, but you may find it somewhat useful anyway, especially if you're willing to work to dig some of this out of a dictionary.&lt;br /&gt;&lt;br /&gt;Dissertation on "Negative Prefixes" in English.&lt;br /&gt;&lt;br /&gt;"a-"  is a Greek prefix meaning "not" or "without".  It is found almost exclusively with words formed from Greek roots.  You can usually spot these by the spellings:  "ph", "th", "y", "rh", "chr", "pn", "mn", final "sis" or "ic".&lt;br /&gt;&lt;br /&gt;theist / atheist&lt;br /&gt;chromatic / achomatic&lt;br /&gt;rhythmic / arhythmic&lt;br /&gt;symmetry / asymmetry&lt;br /&gt;&lt;br /&gt;This prefix is found mostly in scientific terminology, especially in the medical sciences.  "agranulocytosis", "apnea", "amenorrhea", "anemia", "apraxia", "amitosis".&lt;br /&gt;&lt;br /&gt;However, these are not cases where the prefix was applied to an already existing word.  Most people know these words as a single unit.  They are unaware that the initial "a" has a separate meaning of its own.   These should be learned separately, as there are very few pairs like those cited above.&lt;br /&gt;&lt;br /&gt;This prefix is also confusable with the native English prefix "a-", as in "ago", "asleep", "aside", which does not have anything to do with negation.&lt;br /&gt;__________&lt;br /&gt;&lt;br /&gt;non- has almost exactly the same meaning as "un-", but is less frequent, and here again the best approach is to learn these separately.  It occurs more freely with nouns than many of the other prefixes do.  Here are a few common ones:&lt;br /&gt;&lt;br /&gt;partisan / nonpartisan &lt;br /&gt;sectarian / nonsectarian&lt;br /&gt;violence / nonviolence&lt;br /&gt;standard / nonstandard&lt;br /&gt;compliance / noncompliance&lt;br /&gt;proliferation / nonproliferation&lt;br /&gt;sense / nonsense&lt;br /&gt;&lt;br /&gt;The last listed is the only one where the stress shifts to the prefix.&lt;br /&gt;__________&lt;br /&gt;&lt;br /&gt;"in-" is a prefix from Latin, so it is usually seen when the root is from Latin.  While native English roots tend to be monosyllabic, Latin roots tend to be polysyllabic. "in-"changes to "im-" before "m", "p", and "b".  It changes to "il-" before "l" and to "ir-" before "r".  This pattern is quite common with adjectives (derived from Latin).&lt;br /&gt;&lt;br /&gt;articulate / inarticulate&lt;br /&gt;polite / impolite&lt;br /&gt;possible / impossible&lt;br /&gt;modest / immodest&lt;br /&gt;legal / illegal&lt;br /&gt;reverent / irreverent&lt;br /&gt;regular / irregular&lt;br /&gt;sanity / insanity&lt;br /&gt;&lt;br /&gt;Latin also uses the prefix "in-" in other ways, not necessarily for negation, so caution is advised!  For example, "improve" is not the negation of "prove"!  Probably the most maddening of these is the word "inflammable", which means the same thing as "flammable", not the opposite!  You will sometimes see the word "nonflammable", which is more clearly the opposite of "flammable".&lt;br /&gt;__________&lt;br /&gt;&lt;br /&gt;"dis-" is also a Latinate prefix, but it often means more than the simple negation of "un-".  With verbs it may imply some action (often of removal) employed to create a negative state or the absence of something.  The difference is usually more obvious in the past participle.  Usually the form with "un-" cannot even be used as a verb.&lt;br /&gt;&lt;br /&gt;arm / disarm           (remove weapons from)&lt;br /&gt;&lt;br /&gt;unarmed - not carrying a weapon&lt;br /&gt;disarmed - having had one's weapon(s) taken away&lt;br /&gt;&lt;br /&gt;infect / disinfect     (remove possible sources of infection)&lt;br /&gt;&lt;br /&gt;uninfected - not having an infection&lt;br /&gt;disinfected - having had possible sources of infection removed&lt;br /&gt;&lt;br /&gt;qualify / disqualify   (remove from competition or consideration)&lt;br /&gt;&lt;br /&gt;unqualified - not having the proper qualities or qualifications&lt;br /&gt;disqualified - judged to be unqualified; having been removed from consideration&lt;br /&gt;&lt;br /&gt;The prefix "de-" is also sometimes used in the sense of removal, forming verbs from nouns:  "defrost", "delouse", "dethrone", "devein", "defrock", "declaw", "deice".&lt;br /&gt;&lt;br /&gt;Sometimes the positive form has a prefix which is removed before the negative prefix is added.  "encourage / discourage"  "consonant / dissonant"&lt;br /&gt;With some dictionary work you should be able to discover the difference between the words in these groups as well.  They are rather curious, not to say pathological, examples.&lt;br /&gt;&lt;br /&gt;interested / disinterested / uninterested&lt;br /&gt;prove / disprove / improve&lt;br /&gt;integrate / disintegrate / segregate / aggregate&lt;br /&gt;assemble / disassemble / dissemble&lt;br /&gt;distinguish / distinguishable / indistinguishable &lt;br /&gt;distinguished / undistinguished&lt;br /&gt;claim / disclaim / unclaimed&lt;br /&gt;able / unable / disabled&lt;br /&gt;trust / distrust / trustworthy / untrustworthy&lt;br /&gt;cover / uncover / discover&lt;br /&gt;__________&lt;br /&gt;&lt;br /&gt;"un-" is the native English prefix for negation, but it combines freely with nonnative roots as well.  It is the most used prefix of its kind.  It is used with verbs, adjectives, and adverbs, but also sometimes with abstract nouns -- not with concrete nouns ("*an unchair", "*an unbowl").  It can indicate simple negation (adjective) ("happy / unhappy") or it can indicate reversal of a process (verb) ("lock / unlock").  In this latter role, the prefix "de-" is sometimes used instead.&lt;br /&gt;&lt;br /&gt;able / unable ||  tidy / untidy ||  cooperative / uncooperative || safe / unsafe ||&lt;br /&gt;helpful / unhelpful || grateful / ungrateful || likeable / unlikeable || suitable / unsuitable || kind, unkind&lt;br /&gt;&lt;br /&gt;Whenever there is a common word which is the opposite, the "un-" form does not exist:  high / low (*unhigh, *unlow)  fast / slow (*unfast, *unslow).  But speakers sometimes mistakenly use such forms as "unthaw" for "thaw" (freeze / thaw, *unfreeze / *unthaw) or "unloosen" for "loosen" (tighten / loosen, *untighten, *unloosen).&lt;br /&gt;&lt;br /&gt;pack / unpack ||  dress / undress  ||  screw / unscrew ||  wind / unwind || tie / untie || roll / unroll ||  veil / unveil  || cover / uncover&lt;br /&gt;&lt;br /&gt;(Note how many of these form phrasal verbs with "up", e.g., dress up, wind up, tie up, roll up, cover up.)&lt;br /&gt;&lt;br /&gt;code (encode) / decode ||  activate / deactivate || hydrate / dehydrate ||  humanize / dehumanize || escalate / de-escalate  || brief / debrief&lt;br /&gt;&lt;br /&gt;Here are a few curious examples.  Get out your dictionaries!  These could be challenging!&lt;br /&gt;&lt;br /&gt;rail, derail; plane, deplane; attach, detach, unattached, detached, undetached; compose, decompose.&lt;br /&gt;&lt;br /&gt;Does "derail" mean "remove the rails from"?  If you have all planes removed from the runways, do you deplane the runways?  Can you "rail" something?  Can you "plane" something?  What are the different implications of "attached" and "undetached"?  Don't they mean the same thing (because two negatives (un, de) make a positive)?  Is decomposing really the reversal of composing?&lt;br /&gt;</description></item></channel></rss>