This is a key.(变成一般疑问句,并作否定回答)

问题描述:

This is a key.(变成一般疑问句,并作否定回答)

Is this a key?
No,it isn't.

--Is it a key?
--No it isn't.

is this a key?
no,it isn't.

IS THIS A KEY? YES,IT IS
不知道是不是这个,是的话记得给分啊!!