http://www.englishforums.com/English/GeneralEnglishGrammarQuestions/Forum12.htmAsk your questions on grammar and get your sentence checked. We answer lots of different types of general English grammar questions here.enCSMOD (Build: 3273.32735)http://www.englishforums.com/English/AllTypesOf/gdcnx/post.htm#516678Wed, 21 May 2008 16:04:10 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:516678Avangi0http://www.englishforums.com/English/AllTypesOf/gdcnx/post.htm#516678http://www.englishforums.com/English/comments12-516678.xml<p>Both are possible.&nbsp; Your final analysis is correct.&nbsp; - A.</p><div style="clear:both;"></div>http://www.englishforums.com/English/AllTypesOf/gdcmm/post.htmWed, 21 May 2008 15:47:36 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:516659Seraphin1http://www.englishforums.com/English/AllTypesOf/gdcmm/post.htmhttp://www.englishforums.com/English/comments12-516659.xmlI found both kinds of sentences in books</p><p>&quot;all types of opportunities&quot; and &quot;all types of opportunity&quot; , </p><p>I wonder if one of them is wrong, or if the use of plural or singular form </p><p>depends on whether the &quot;opportunity&quot; refers to a countable or uncountable entity</p><p> </p><p>thanks<div style="clear:both;"></div>