1.jenny isn't a teacher.
Is jenny a teacher?Yes,he is.
2.kate isn't jenny's friend.
Is kate jenny's friend?Yes,she is.
3.kate isn't a boy.
Is kate a boy No,she isn't.
4.jenny isn't in china.
Is jenny in china Yes,he is.
5.jenny isn't fine.
Is jenny fine?Yes,he is.
该否定只需加否定词not,该一般疑问句只需将be动词提前.