1. He took a rest because he felt unwell.
=> Because of...feeling unwell, he took a rest.
2. Although I didn’t eat anything, I didn’t feel hungry. => Despite..not eating anything, I didn’t feel hungry..
3. They slept soundly although the night air was hot. => In spite of..the hot night, the slept soundly.
4. Our flight was delayed because the fog was thick. => Because of...the thick fog, out flight was delayed.

5. She missed the best part of show because of leaving so soon.
=> Because...she left so soon, she missed the best part of (the) show.
6. Despite not trying hard, he always managed to get the work done.
=> Although...she did not try hard, he always managed to get the work done.
7. In spite of the high prices, my brother insisted on buying a motorbike. => Although...the prices were high, my brother insisted on buying a motorbike.
8. I went to work late because of the bad traffic.
=> Because... the traffic was bad, I went to work late.

Rewrite the following sentence by using Because + clause, Because + N/ cụm N :
1. He is bad at English because he is very lazy.

=> He is bad at English because of his laziness.
2. He didn't come to class because of his illness.

=> He didn't come to class because he was ill.
3. Everyone likes and admires her because of her intelligence.

=> Everyone likes and admires her because she is intelligent.
4. The flight 202 was delayed because the weather was bad.

=> The flight 202 was delayed because of the bad weather.
5. I didn't come on time because it rained heavily.

=> I didn't come on time because of the heavy rain.
6. They can't miss the meeting because of its importance.

=> They can't miss the meeting because it is important.
7. I was late for the meeting because the traffic was heavy.

=> I was late for the meeting because of the heavy traffic.
8. My grandmother can't work hard because of her age.

=> My grandmother can't work hard because she is old.

Exercise 5: Rewrite the sentences, using because/because of

1.    He didn’t come because of his sickness.

=>He didn’t come because he was sick

2.    The train was late because the fog was thick.

=>The train was late because of the thick fog

3.    The plane couldn’t take off because of the bad weather.

=>The plane couldn’t take off because the weather was bad

4.    He left the school because his family was poor.

=> He left the school because of his poor family 

5.    We couldn’t study because of the noise.

=>We couldn’t study because it was noisy

6.    I didn’t go swimming because it was cold.

=> I didn’t go swimming because of the cold

7.    These students arrive late because of the bad traffic.

=>These students arrive late because the traffic is bad

8.    Mary can’t sleep because she has drunk a cup of strong coffee.

=>Mary can’t sleep because of drinking a cup of strong coffee.

9.    Because of getting up early, he wasn’t late for the first train.

=>Because he got up early, he wasn’t late for the first train.

10.  He was accepted for the job because he had much experience.

=>He was accepted for the job because of having much experience.

Exercise 6: Rewrite the sentences, using because/because of

1.    Kevin has failed many times, so he disappointed.

=> Because Kevin has failed many times, he disappointed.

2.    I had not eaten for 24 hours. I was very hungry.

=> Because I had not eaten for 24 hours, I was very hungry.

3.    He ate all the fruits. The fruits were ripe.

=> He ate all the fruits because they were ripe.

4.    He hadn’t finished the letter. He didn’t go to sleep.

=> Because he hadn’t finished the letter, he didn’t go to sleep.

5.    He is dismissed. He was late for the work very often.

=>He is dismissed because of being late for the work very often.

6.    He drove too fast. He caused a serious accident.

=> Because of driving too fast, he caused a serious accident.

7.    The streets are narrow, so there are not many people driving cars in this city.

=> Because the streets are narrow, there are not many people driving cars in this city.

8.    The test was so difficult that I couldn’t do it.

=>   Because the test was so difficult, I couldn’t do it.

9.    I don’t know Russian. I have to have my document translated into Russian.

=> Because I don’t know Russian, I have to have my document translated into Russian.

10.  The children had an accident. They went to school late.

=>The children had an accident because of going to school late.

1.Because kevin has failed many times , so he disappointed

2.I was very hungry because i hadn't eaten for 24 hours

3.Because the fruits were ripe . he ate all the fruits

4.He didn;t go to sleep because he hadn't finhished the letter

5.He is dismissed because he was late for work very often

6.He caused a serious accident because he drove so fast

7.Because the streets are narrow , so there aren't many people driving car in this city

8.I couldn't do the test because it was so diffcult

9.Because i don't know russian , i have to have my document translater into russian

10.The children had an accident because they went to school late

rewrite the sentences , using because / because of

1. he didn't come because of his sickness

He didn't come because he was sick

2. the train was late because the fog was thick

The train was late because of the thick fog

3. the plane couldn't take off because of bad weather

The plane couldn't take off because the weather was bad

4. he left the school because his family was poor

He left the school because of his poor family

5. we couldn't study because of the noise

We couldn't study because it was noisy

6. I didn't go swimming because it was cold

I didn't go swimming because of the cold

7. these students arrive late because of the bad traffic

These students arrive late because the traffic is bad

1.because of her being sick mary didn't go to school

-Because Mary was sick, she didn't go to school

2.she went to beb early because of her feeling tired

-Because she felt tired, she went to bed early

3.because of her having a bab cool she didn't go to the circus with betty

-Because she had a bad cold, she didn't go..

4.john succeded in his exam because of his working hard and methodically

-Because John worked hard and methodically, he succeded in his exam

5.because of her mother's sickness she stayed home

-Because her mother was sick, she stayed at home

6.i like him because of his father is kinding to me

-Because his father is kind to me, I like him

7.because of their greening i can't eat there fruits

-Because these fruits are green, I can't eat there

8.i couldn't do the test because of it's being difficult

-Because the test was difficult, I couldn't do it

9.he came home late because of it's raining heavily

10.the train came late because of it's being foggy

-Because it was foggy, the train came late

11.because of the traffie lights turning Red we stopped the car

-Because the traffic lights turned red, we stopped the car

12.the train was late because of the fog being thick
- Because the fog was thick, the train was late

13.rice plants grow well because the climate is warning and damp

-Because of the warm and damp climate, rice plants grow well

14.because of the street being crowed and narrow he couldn't drive fast

-Because the street was crowed and narrow, he couldn't drive fast

1 Because of an accident, I was late

2 Because the weather was bad, we delayed our trip

3 Because of the picture's beauty, I like it

4 Because of his height, Nam can reach the book on the shelf

5 Because he is ill, he can't drive

III. Rewrite sentences that they have the same meaning with the given ones. Use the words in brackets.

1. Because there was an accident, I was late. (because of) Because of the accident, I was late.

2. We delayed our trip because of the bad weather. (because)

because th weather was bad, we delayed our trip 

3. I like this picture because it's beautiful. (because of)

I like this picture because its beaty

4. Because Nam is tall, he can reach the book on the shelf. (because of)

because of being tall , nam can reach the book on the shelf.

5. He can't drive because of his illness. (because)

 He can't drive because he is ill

1. Mary didn't go to school because he was ill.
->Mary didn't go to school because of his illness
3. All the students love the principal because he is very kind.
- All the students love the principal because of his kindness
4. The president was unable to continue his work because he was ill.
->The president was unable to continue his work because of his illness
5. He retired last month because he was ill.
-> He retired last month because of his illness
6. Because of my mother's illness, I stayed at hom to take care of her.
-> Because my mother was ill, I stayed at hom to take care of her.
7. Everybody loved him and usually came to see him for advice because of his wisdom nd good-heartedness.
=> Because he was wise and good-hearted, everybody loved him and usually came to see him for advice
9. The flight was cancelled because of the fog.
->The flight was cancelled because it was foggy
10. Many people refused to do Paula's job because of the danger.
-> Many people refused to do Paula's job because it was dangerous