变复数1.This is a knife2.That is an apple tree3.He is a policem

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 is a pen.改复数形式 this is an apple and that is a 写出复数句. That's a ruler.对 a ruler 提问.Is this an apple?改为复数句子. This is an apple,that's a knife （）1.This is () pear and that is () apple.A.a,an B.a,a C.an,a this is an apple.改成复数形式 This is an apple 变为复数句子 英语改复数形式That is a dictionary This is an exercisebook It is a what a big apple is!复数怎么变,how big the apple is!的复数 this,is,an,and,book,that,a,is,apple 连词成句