is this your key?改句子is this your key?改否定句,肯定句,肯否定回答,把肯定句变为复数句,把复数句变为一般疑问句肯否定回答

Yes ,it is .
No ,it isn't .
This isn't your key .
This is your key .
These are your keys .
Are these your keys ?
Yes ,they are .
No ,they aren't .

否定句 this isn't your key
肯定句 this is your key
肯定回答yes，it is my key
否定回答no，it isn't my key
肯定句复数句，these are your keys
复数句一般疑问句are these your keys？
肯定回答yes，these are
否定回答no，these aren't

否定句 This is not your key.
肯定句 This is your key.
肯定回答 Yes. This is my key.
否定回答 No. This is not my key.
复数句 These are your keys.
一般疑问句 Are these your keys?
肯定回答 Yes. They are.
否定回答 No. They aren't.