Change the following sentences into the negative and interrogative:Students often have to work at the laboratory after classes. 2. Tony had to take entrance exams in August. 3. You will have to come here twice a week. 4. She had to spend a lot of money on books. 5. They had to stay
there for a long time. 6. Ann always has to get up early. 7. He has to work hard at his pronunciation. 8. Lucy
has to help her little brother and sister to prepare their lessons. 9. You will have to join some sports society. 10.
She has to clean the flat herself.