1. We pollute the air. We have breathing problems. ( If )

⇒If we are pollute the air, we will have breathing problems.

2. He has a lot of time tomorrow. He will be able to sê a movie ( So )

⇒He has a lot of time tomorrow so he will be able to see a movie.

3. I phone hi, twice. He didn't listen to me. ( but )

⇒I phone hi, twice but he didn't listen to me. 

4. She said sorry to her father. She has broken his favourite vase ( because )

⇒She said sorry to her father because she has broken his favourite vase.

5. We make the air dirty. We use the cars all the time ( If )

⇒If we are make the air dirty, we will use the cars all the time.

6. He was tired las night. He stay up late to watch a football match ( because )

⇒He was tired las night because he stay up late to watch a football match.

7. Nobody in our class in younger than Nam. ( youngest )

⇒Nam is the youngest student in our class.

Comlpete the sentences

1. We/not/see/each other/10 years

⇒Wehaven't seen each other for10 years.

2.Tom and Joanna/go/to France/last summer.

⇒Tom and Joanna went to France last summer.

3. I/not have/a birthday party/ this year.

⇒I am not have a birthday party in this year.

4.If/ Nam/be/late./we/wait/him

⇒If Nam is late, we will wait him.

5. If/rese/bottles,/save/ a lot/money

⇒If you rese bottles,you will save a lot of money.

6. My family/be/here/since Christmas.

⇒My family has been here since Christmas.