Use the third conditional:
1) If you -------- (not/be) late, we ---------- (not/miss) the bus.
2) If she -------- (study) she ------- (pass) the exam.
3) If we --------- (arrive) earlier, we ------- (see) John.
4) If they ------- (go) to bed early, they ------ (not/wake) up late.
5) If he ------ (become) a musician, he ------ (record) a CD.
6) If she ------ (go) to art school, she ------- (become) a painter.
7) If I ------- (be) born in a different country, I ------ (learn) to speak a different language. 8) If she ------- (go) to university, she ------ (study) French.
9) If we ------ (not/go) to the party, we ------- (not/meet) them.
10) If he ------- (not/take) the job, he ------- (go) travelling.
11) He ------- (be) happier if he ------ (stay) at home.
12) She ------- (pass) the exam if she ------- (study) harder.
13) We ------- (not/get) married if we ------- (not/go) to the same university.
14) They ------- (be) late if they ------- (take) a taxi.
15) She -------- (not/meet) him if she ------- (not/come) to London.
16) He -------- (take) a taxi if he ------- (have) enough money.
17) I ------ (call) you if I ------- (forget) my phone.

--1hadn't been, wouldn't have missed2had studied, would have passed3had arrived, would have seen4had gone, wouldn't have woken5had become, would have recorded6had gone, would have become7had been, would have learnt8had gone,would have studied9hadn't gone, wouldn't have met10hadn't taken, wouldn't have gone11would have been,  had stayed12would have passed,  had studied13woulddn't have got ,  hadn't gone14would have been, had taken15wouldn't have met, hadn't  come16would have taken, had had17would have called,had forgotten

1 if you hadn't been , we wouldn't have missed the bus.2 if she had bought, she would have passed the exam like3 if we had arrived earlier, we would have seen John. 4 If they had gone to bed earlier, they wouldn't have woken up late.5 if he had become a musician, he would have recorded a CDMA. 6 if she had gone to art school, she would have become a painter. 7 if I had been born in a different country , I would have learned to speak a different language. 8 if she had gone to university, she would have studied French. 9 if we hadn't gone to the party, we wouldn't have met them,10 if he hadn't taken the job, he would have gone travelling. 11 He would have been happier if he had stayed at home.12 She would have passed the exam if she had studied harder.13 We wouldn't have got married if we hadn't gone to the same university. 14 They would have been late if they would have taken a taxi,15 She wouldn't have met him if she hadn't come to London. 16 He would have taken a taxi if he had had enough money. 17 I would have called you if I had forgotten my phone.