把下列句子由单数变为复数或由复数变为单数.1、This is a book.2、That is a box.
问题描述:
把下列句子由单数变为复数或由复数变为单数.1、This is a book.2、That is a box.
3、Are those rulers?4、What are these.5、They are toys
答
These are books.
Those are boxes.
Is that a ruler ?
What's this ?
It's a toy.