1. He couldn't meet you because he was busy.

2. She went to bed early because she was sick.

3. Nobody can do this test because it is difficult.

4. Two cars can't pass each other because the road is narrow.

5. We spent the whole day in the garden because the weather was lovely.

6. He can't go to school today because he has a toothache.

7. I can't play basketball because I am short.

8. She must stay in bed because she is sick.

9. We can't swim in this part of the river because the water is high.

10. They couldn't keep on clearing the beach because it rained heavily.

1)he couldn't meet you because of being busy

=>he couldn't meet you because he was busy

2)she went to bed early because of her sickness

=>she went to bed early because she was sick

3)nobody can do this test because of its difficulty

=>nobody can do this test because it's difficult

4) two cars can't pass each other because of the narrow road

=> two cars can't pass each other because the road is narrow

5)we spent the whole day in the garden because of lovely weather

=>we spent the whole day in the garden because the weather waslovely

6)he can't go to school today because of his toothache

=>he can't go to school today because he has a toothache

7)i can't play basketball because of my height

i can't play basketball because i'm not tall

8)she must stay in bed because of her illness

=>she must stay in bed becauseshe is ill

9)we can't swim in this part of the river because of highly polluted water

=>we can't swim in this part of the river because its water ishighly polluted

10)

they couldn't keep on clearing the beach because of heavy rain

=>they couldn't keep on clearing the beach becauseit rainsheavily