Ex1:

1. He is very tired, but he has to finish his homework.

2. Although the room is very small, it is quite comfortable.

3. I like watching TV and going to the cinema.

4. He forgot his umbrealla. Therefore, he got wet.

5. She wears glasses because she want to see better.

6. We want to buy a new house, so we are saving money.

Ex2:

1. If she comes late again, she will lose her job.

2. If I win this competition, I will give the award to the unlucky people.

3. If we go by train, it will be cheaper.

4. If we go by plane, it will be quicker.

5. If you need more bags, I'll give you some.

6. If we throw these bottles over the hedge, that will pollute the wood.

Ex3:

1. Peter is not old enough to see the horror film.

2. Don't forget to turn off the light before going out.

3. What an intelligent girl!

4. I am going to come over to pick you up.

5. Nien is younger than Hoa.

Ex4:

1. keep on - will run out

2. run out - will need

3. use - will increase

4. increases - will die