1. when I was young I used to go to school on foot, because we didn't have a car
2. when she was young she didn't used to go to the theatre
3. I used to smoke 5 years ago
4. he didn't used to drive his car carefully
1. you'd better go to the doctor's office, you look pale
2. I'd rather not go to the college with him, because he drives his car like a maniac
