1.I·m in class Nine Grade seve.2.She is Jane.3.He is Twelve.4.I am thirteen.

I'm not in Class nine Grade seven.
Is she Jane?
Yes,she is./No,she isn't.不是啊 是每一个都 变否定，疑问，肯定否定回答1 I'm not in Class nine Grade seven.Are you in Class nine Grade seven?Yes, I am./No, I'm not.2 She isn't Jane.Is she Jane?Yes, she is./No, she isn't. 3 He isn't twelvw.Is he twelve?Yes, he is./No, he isn't.4I'm not thirteen.Are you thirteen?Yes, I am./No, I'm not.