1.Unless you hurry, you'll be late for school.
2.Unless I didn't have money, I would lend you some.
3.Unless he weren't careful , he wouldn't have an accident.
4.Unless he doesn't work hard ,you can pass the exam.
5.Unless I didn't understand the lesson, I wouldn't have to ask you.

1. Unless you hurry, you'll be late for school.
2. Unless i had money, i wouldn't lend you some.
3. Unless he were careful,  he would have an accident.
4. Unless he works hard, he can't pass the exam.