1. lf you tell your parents the truth, they will believe you
2. lf the lift had been working, l would not have come up the stairs
3. lf we had listened carefully, we would not have made mistakes
4.lf Geogre had been able to answer, he would not have got a bad mark
5. lf we had not got stuck in the traffic jam, we would not have been late for school
7. ì people realized how important it is to conserve energy, they would do something about it
Giúp dc nhiu đây, bạn học tốt nhé