Resposta:

1) Mr. Stuart has been watching TU for two hours.

Negative: Mr. Stuart hasn't been watching TU for two hours.
Interrogative: Has Mr.Stuart been watching TU for two hours?

2) She has been reading book for three months

Negative: She hasn't been reading book for three months.
Interrogative: Has shebeen reading book for three months?

3) Mr.s Brown has been cooking for and hour.
Negative: Mr.s Brown hasn't beeing cooking for an hour.
Interrogative: Has Mr.s Brown been cooking for an hour?

4) Sophie has been preparing the dimer.

Negative: Sophie hasn't been preparing the dinner.
Interrogative: Has Sophie been preparing the dinner?

5) They have been studying english for three years.

Negative: They haven't studying english for three years.
Interrogative: Have they been studying english for three years?

6) Paw and Mary have been copying the homework​

Negative: Paw and Mary haven't been copying the homework.
Interrogative: Have Paw and Mary  been copying the homework?