I,
1. I didn't receive the letter which my mother sent me last month.
2. The factory where we visited yesterday makes exported furniture.(đã sửa)
3. The baby likes those songs which his grandmother sings every evening.
4. The farm where we visited last Sunday produces milk.(đã bổ sung)
5. The man whose daughter we play with every day is an engineer.
II,
1. If he had worked hard last term, he wouldn't have lost his job.
2. If Mary had had money with her, she could have bought that present.
3. If I had known that there was a test yesterday, I would have studied.
4. If I had known that your friend was in the hospital, I would have visited her.
5. If I had known that I've never met your friend, I would have introduced you.
III,
1. Mary apologized for not phoning you earlier.
2. Peter has always dreamed of being a spaceman.
3. Tom said that if Jenna had loved him, she wouldn’t have left like that.
4. My mother said that if I had had a permit, I could have found a job.
5. Jim said that If he caught the bus, he would be home by six.
