Rewrite 
1. Hurry up or you will be late.
 -> If................................
2. She is very busy, so she can't help me 
 -> If................................
3. You're unfit because you don't take exercise
 -> If................................
4. Unless you are careful, you will cut yourself with that knife
 -> If.................................
5. If I have time, I'll help you.
 -> Unless...................................
6. Dick often causes accidents because he drives carelessly.
 -> If.......................................
7. I can't apply for that job because I don't know English.
 -> If...........................................
8. Susan is overweight because she eats too much chocolate.
 -> If......................................
9. His father often punishes him for his laziness.
 -> If......................................
10. Study harder or you'll fail in the next exam.
 -> If......................................