Chuyển sang câu bị động:
1. If you don't break the rules, the teacher won't punish you.
→
2. If Tom threw a party, I would refuse his invitation.
→
3. If Mary didn't accept his proposal, he might sell his house.
→
4. If teacher had corrected the exercises, the students wouldn't have made many mistakes.
→
5. She won't buy this car if it doesn't appear any new features.
→
6. John sells his house because ghosts haunt it.
→