1He is a boy.2This is an apple.3That is a dog.4I am a teache

变复数1.This is a knife2.That is an apple tree3.He is a policem 将下列句子变复数1.I am driver 2.That is an apple 3.He has a book This is an apple,that's a knife I am an old dog.His a lucky dog.She is a lazy dog. This a watch.That is his brother.He is a boy.She is a Chines （）1.This is () pear and that is () apple.A.a,an B.a,a C.an,a That book is new.I am a boy.She is a girl.Is the dictionary This is an eraser That is a This is ________ pear. That’s ________ apple. A．a...a B．an.. this,is,an,and,book,that,a,is,apple 连词成句 This is an apple.that is a pen.改复数形式 this is an apple and that is a 写出复数句.