按要求改写句子。
1. Sam's mother is a nurse. (对划线部分提问)
________ _________ Sam's mother _________?
2. They are English teachers. (改成单数)
He _______ _________ English teacher.
3. Her father is a doctor. (改成否定句)
Her father ___________________.
4. I’m a nurse. （对划线部分提问）
_______________________?
5. I want to be an office worker.(对划线部分提问)
_______________________________?
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