Model 1: She used to help him a lot with his English. Now she doesn't have to. He knows the language quite well.
1. I used to lose a lot of time to get to the office. Now I don’t have to. I work nearby.
2. When he was a student he used to work mostly in the library. Now he doesn’t have to. He works in a good company.
3. She used to argue a lot on the subject. Now she doesn’t have to. She knows how to negotiate with people.
4. He used to copy a lot of documents by hand. Now he doesn’t have to. He has the modern copier in the office.
5. When she came to live in this country she used to ask a lot of questions. Now she doesn’t have to. She is quite familiar with the place.
Model 2: Now I must think of such things but last year I didn't have to.
1. With this new job I must keep a lot of things in my mind, but a few months ago I didn’t have to.
2. Now we must get up very early but during our vacation we didn’t have to.
3. Now she must take a bus to get to the Institute but when she lived in the center she didn’t have to.
4. Now he must help his parents but a few years ago he didn’t have to.
5. Now I must go to my dentist rather often but when I was your age I didn’t have to.
