Phần chuyển câu If you

Phần chuyển câu If you
1. He fails the exam because he doesn't learn hard
- If
2. We don't go swimming as we feel tired
- If
3. The house is so expensive that they can't buy it 
- If
4. She is too tired, so she doesn't want to go
- If
5. He doesn't have enough for us to buy
- If