s that your book?---Yes,________.这为什么填的是yes,it is .而不是yes,that is .所有以Is that 开头问的都要用it is回答吗?

That's my book.This's your book.为什么that's可以连写 What's that in your book答句 that's my book.this's your book.有没有语病 Where's your English book? how's your book going Grace,is that your English book?yes,( )括号里的单词必须是S打头的 Sam,it's the third time that you_______(forget) to bring your maths book. Is that your book?改为同义句 It's this your pencil? -Yes,itis. It's that you book? -Yes,it is 错误 怎么改 That's your job? Is this your book?( ),it's( ) 写出下列句子的复数形式this is my book.is that your sister?that is my baseball.is this your friend?what's this in english? 是Is that your English book?还是That is your English book? Is this your book?单复数句互变That's his dictionary.These're my pencils.Those are baseballs. 2.this book is different--that one 2.don't read---the sun.it's bad--your eyers Sam,it’s the third rime that you （）（forget）to bring your Maths book 动词填空 怎么提问That's a grey bird Your new book?It's on Paul's desk.Robert's new socks are green. 1：a friend of my father's 2：a friend of Li Ming's 3：that book of yours（能否改成your's) 前两句有什么语法区别?