1 Tom washed my car
-> I had my car washed by Tom
2 they have built a new building
-> A new building has been built
3 he stops smoking because he is sick
->If he wasn't sick, he wouldn't stop smoking
4 she couldn't give the answer ,so she failed in the interview
-> if she had given the answer, she wouldn't have failed in the interview
5 Tim studied hard, so he gets a good job
->If tom had studied hard, he would have got a good job