1. save some money or you won't able to buy the house
=> if.................................
2. because i don't meet her, i don't give her your letter
=> if....................................
3. they are too slow, they can't win the match
=> if..................................
4. she is too weak, she can't take any exercise
=> if....................................
5. people don't understand him because he doesn't speak clearly
=> if...................................
6. i didn't watch tv last night because i was busy
=> if....................................
7. i didn't see the signal, so i didn't stop
=> if.....................................
8. we got lost because we didn't have a map
=> if..................................
9. we stayed up late last night and we were so tired
=> if..................................
10. he wasn't able to answer the questions, so he failed the exam
=> if................................