1. “You don't have to take the bus to work, do you?” “Yes, I do. It's too far to walk.”
2. “Your collegue dosen't have to ring the factory manager again, dosen he?” “No, he dosen't.”
3. “We don't have to answer all those letters at once, do we?” “No, of couse not.”
4. “she dosen't have to give up swimming, does he?” “Yes, she does, I'm afraid. The doctor says so.”
c.
1. “Which days do you have to get up early?” “Wednesdays and Fridays.”
2. “Why do we have to stay so late in the office?” “There's a lot of work today.”
3. “Why does your wife have to spend so much time cooking?” “She dosen't. She simply loves cooking. It's her hobby.”