3. Maybe she will come here tomorrow. (POSSIBLE)
=> There is a possibility that she will come here tomorrow.
4. Lily cleaned the house, but her mother had cleaned it before. (NEEDN'T)
=> Lily needn't clean the house.
5. He had a lot of homework to do but he did not do them. (SHOULD)
=> He should do a lot of homework.
6. I would have been able to finish the report if I had had more time. (COULD)
=> If I had had more time, I could have been able to finish the report.
7. I'm sure they haven't called yet. (CANT)
=> They can't call yet.