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/Subject/ldkk/post.htm#55090Sat, 13 Nov 2004 05:55:55 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:55090King0http://www.englishforums.com/English/Subject/ldkk/post.htm#55090http://www.englishforums.com/English/comments12-55090.xmlSentence 2 is correct, because "they" is a plural pronoun meaning several people, and "friends" is the plural form of "friend". <br /> <br />Sentence 3 is correct in the second group, because "this" is singular, and "book" is singular. If you wanted to make sentence 4 correct, you would have to change it to "These are their books", as "these" is the plural form of "this".http://www.englishforums.com/English/Subject/ldjp/post.htmSat, 13 Nov 2004 04:35:34 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:55078hanuman_20001http://www.englishforums.com/English/Subject/ldjp/post.htmhttp://www.englishforums.com/English/comments12-55078.xmlSir, <br /> <br />1.They are my friend. <br /> <br />2.They are my friends. <br /> <br />Which one is correct? <br /> <br />Here my doubt is aboy "my friend" "my friends". <br /> <br />As ,the subject is "they" and the verb "are" is according to the subject "they". <br /> <br />Should I write "my friends" or "my friend"? <br /> <br /> <br />3.This is their book. <br /> <br />4.This is their books. <br /> <br />Which one is correct? <br /> <br />Thanks. <br />