The backpack (on the chair) is Li Lei's?对括号里的提问.我觉着应用where.但答案是which,怎么回事?到底什么时候用where什么时候用which?The boy （ under the tree） is Li Lei.对括号里的提问.(Which)(boy)is Li Lei?Her b

The backpack is on the (sofa)对划线部分提问 Is the backpack on the floor No,it is 改错 My English book and my backpack ___ on it____is in the backpack? 填空 His backpack is on the on the desk对on the desk画线提问 把单词连成句 chair,on,my,is,backpack,the My backpack is (on the chair.)对括号部分提问! his backpack is on the floor.划线提问 Mary's backpack is on the sofa.(就on the sofa 提问) Your backpack is on the chair.对on the chair 部分提问 It is in the backpack? It is in the backpack? lt's in the backpack. on,Tv,my,is,and,under,table,the,backpack,is,it,the 怎么连成一句话 变特殊疑问句The backpack on the desk is the teacher's分别对the backpack、on the desk、the teacher's提问写出原因!（按照一般方法改起来有点怪） His backpack is on the bed.(改成一般疑问句)怎么改 His backpack is on the bed.(改成一般疑问句)怎么改 Is that his backpack the lost and found case?”处填什么?on in at of? can you please put your backpack on the desk?改为祈使句