1.Mary has been a nurse for seven years否定句,疑问句,回答 2.Tom has done his homework.2.Tom has done his homework.否定句,疑问句,回答

1.Mary has been a nurse for seven years否定句,疑问句,回答 2.Tom has done his homework.2.Tom has done his homework.否定句,疑问句,回答
1.Mary has been a nurse for seven years否定句,疑问句,回答 2.Tom has done his homework.
2.Tom has done his homework.否定句,疑问句,回答

1.Mary has been a nurse for seven years否定句,疑问句,回答 2.Tom has done his homework.2.Tom has done his homework.否定句,疑问句,回答
1.Mary hasn't been a nurse for seven years.
Has Mary been a nurse for seven years?Yes,she has./ No,she hasn't.
2.Tom hasn't done his homework.
Has Tom done his homework?Yes,he has./ No,he hasn't.