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Hello:

The USUAL rule for forming plural nouns is to add an "S".
There are reasonably well-established rules for forming plural nouns in special cases.

The USUAL rule for 3-rd Pers Sing verbs is to add an "S".
Q. What, if any, are the rules for forming 3-rd Pers Sinig verbs in special cases.
Are they the same as for the plural noun?
This is of especial concern when the same word may be either a noun or a verb.

My question deals with the Plural noun /vs/ the Third-person-singular verb inflection.

The USUAL plural ...
one book two bookS
one lift two liftS
The USUAL inflection on the 3-rd person singular..
I lift We lift
You lift You lift
He liftS They lift

The SPECIAL cases of plurals may be exemplified as .
one try two tries (as with attempts)
one carry two carries (as with tooth cavities)
one empty two empties (as with bottles)
one finish two finishes (as with paints)
one fly two flies (as with insects)
one loaf two loaves (as with bread)

But what about the SPECIAL cases of the inflection on the 3-rd person singular;
it seems less obvious, as in these cases ..
he destroys / destroies sand dunes
he trys / tries jumping high
he carrys / carries the load
he emptys / empties the glass of milk
he finishs / finishes the task
he flys / flies the airplane
he loafs / ??? on the couch
would appreciate reasoned choices in the above and some rule(s).

Thanks,,
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See (for nouns)
Special cases
on this page at this grammar site:

http://grammar.ccc.commnet.edu/grammar/plurals.htm
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All the rules for adding S are the same for plurals as for third-person singular present tense verbs, including the words that end in y.

That said, there are a few exceptions that you will encounter from time to time, for example, words that end in f or fe. There are so few that you can just make a mental note of them when you encounter them.

Noun: loaf, loaves
Verb: loaf, loafs
Noun: knife, knives
Verb: knife, knifes

CJ
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Comments  
Digger36But what about the SPECIAL cases of the inflection on the 3-rd person singular;
it seems less obvious, as in these cases ..
he destroys / destroies sand dunes
he trys / tries jumping high
he carrys / carries the load
he emptys / empties the glass of milk
he finishs / finishes the task
he flys / flies the airplane
he loafs / loaves on the couch
would appreciate reasoned choices in the above and some rule(s).

Thanks,,
Change y into ie only when it ("y") is preceded by a consonant.
Add es when a word ends in s, sh, ch, x or o.
 CalifJim's reply was promoted to an answer.
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