what is this?改复数句 This is a book.改一般疑问句 These are feet 对feet提问 These are eyes.单数句

问题描述:

what is this?改复数句 This is a book.改一般疑问句 These are feet 对feet提问 These are eyes.单数句

What are these?
Is this a book?
What are these?
This is an eye