this your book改复数,单复数句型各变疑问句.she is my mother.变疑问句,否定回答 tthose are my toys变问句,变单数句子.单数变疑问句these are his rules变问句.变单数.单数变疑问句

1.These are your books.--Are these your books?
2.Is she your mother?-- No, she isn't.
3.Are those your toys? -That is my toy.--Is that your toy?
4.Are these his rules?- This is his rule.-Is this his rule?

1.These your books 2.Are these your books? 3.Is this your book? 4.Is she my mother? 5.No,she isn't. 6.Are those my toys? 7.That is my toy. 8.Is that my toy? 9.Are these his rulers? 10.This is his ruler. 11.Is this his ruler?

These are your books.
Is this your book?
Are these your book?
Is she your mother?No,she isn't.
Are those your toys?
That is my toy.
Is that your toy?
Are these his rulers?
This is his ruler.
Is this his ruler?

第一个问题好像有一些情况。