ex 2:
1. ....... he would have had an accident
2. I would give ........
3. ..... you hadn't met her in the street
4. If Robert studies hard, ...........
ex 3:
1. c. wake up
2. a. would learn
3. b. had arrived
4. a. had gone
ex 4:
1. If you had written a letter to me, I would have replied to you.
2. I would have helped you if I had known that you needed me.
3. I'll go on the trip if I have money.
4. If I studied I would pass the exam.
5. I would have been smarter if I had studied Chinese.
