把单数改成复数,把复数改成单数 说明理由 This is a book That is a box Are those rulers What are these? They are toys That is an egg What's this in english? Your bok isn't in the desk Is it your schoolbag?
These are books Those are boxes is that a ruler What is this? it is a toy Those are eggs What are these in English? Your books aren't in the desk are they your schoolbags?