He is fine
否定句：He isn't fine
一般疑问句：Is he fine?
肯定回答：Yes,he is
This is a book
否定句：This isn't a book
一般疑问句：Is this a book?
肯定回答：Yes,this is
My name is Tony
否定句：My name isn't Tony
一般疑问句：Is your name Tony
肯定回答：Yes,it is
His phone number is 235-6125
否定句：His phone number isn't 235-6125
一般疑问句：Is his phone number 235-6125
肯定回答：Yes it is