Ответ:
1.If he had studied harder, he would has passed his test better then.
2.If we had begun the work earlier, we would have had more time.
3.Lena would has bought the milk if she had forgotten about it.
4.They wouldn't have got into that accident if Jim hadn't driven so fast.
5.The dogs would have got out if the door had been locked.
6.If Jenny had asked me about the matter I would have answered all her questions.
7.I would have called the police if I had seen those robbers again.