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IX/
1. Though the weather was hot, we went outside.
2. Though she was sick, she went to work.
3. Though it rains, he goes on working.
4. Though his song is happy, everyone hates it.
5. Though she doesn't study well, she passes.
6. Though her behavior is bad, they still like her.
7. Though he was lazy, he passed.
8. Though I am bored, I still sing.
9. Though her preparation is good, everything goes wrong.

VIII/
1. He last brought an umbrella a long time ago.
The last time he brought an umbrella was a long time ago.
It's a long time since he last brought an umbrella.
2. He started smoking a long time ago.
3. She hasn't made a cake for two weeks.
4. He has waited for the bus for an hour.
5. It's the first time he has waken me up.
6. We have never earned money before.

III/
1. If you are not early, you'll be punished.
2. If you are helpful, people will love you.
3. If we don't study studiously, we can't get good mark.
4. If Lan didn't have to do a lot of homework, she wouldn't stay at home.
5. If she studied E well, she would feel happy.
6. If the weather isn't good, we can't go.
7. Unless the boy studies well, he will fail.
8. If it rained, we would bring an umbrella.