1. my friend lives a long way from his office and has to get up early
2. all of us must be in time for classes
3. when my friend has his English, he has to stay at the office after work.
He does not have to stay at the office on Tuesday, Thursday and Saturday and can
get home early.
4. Do you have to work hard to do well in your English?
5. " Should we discuss this question now?" "No , we needn't. We can do it tomorrow afternoon."
6. "Please send them this article." "Oh, should I do it now?