http://www.englishforums.com/English/BasicEnglishGrammarQuestions/Forum43.htmFor Basic English ONLY. Please post only <b><font color=red>easy</font></b> questions and answers here.enXMOD (Build: 3616.28671)http://www.englishforums.com/English/WhichIsAre/vpwrd/post.htm#410108Tue, 26 May 2009 06:11:09 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:410108Grammar Geek0http://www.englishforums.com/English/WhichIsAre/vpwrd/post.htm#410108http://www.englishforums.com/English/comments43-410108.xmlYes, there's a very simple rule. Is one correct? Then "Which (of these) is correct?" Is more than one correct? Then "Which (of these) are correct?" The same with the theories. If there is only one that is correct, use the singular "is." If the possibility existst that two or more or corect, then use the plural "are."http://www.englishforums.com/English/WhichIsAre/vpwrd/post.htmTue, 26 May 2009 06:11:09 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:410094Anonymous1http://www.englishforums.com/English/WhichIsAre/vpwrd/post.htmhttp://www.englishforums.com/English/comments43-410094.xmlHi, How should one use which with is and are, as in... Is there a hard and fast rule? Which of these ARE/IS correct ? Of these theories, which ARE/IS correct? Thanks