16)  Mary didn’t go to school yesterday because she was sick.

>> Because of her sickness, Mary didn’t go to school yesterday 

17)  She went to bed early because she felt tired.

>>Because of feeling tired,  She went to bed early 

18)  Margaret stayed at home because her mother was sick.

>> Because of her mother's sickness, Margaret stayed at home

19)  I couldn’t do the test because it was difficult.

>> Because of the difficult test, I couldn’t do the test 

20)   I couldn’t read the letter because it was dark.

>> Because of the darkness, I couldn’t read the letter 

21)   I can’t study because it is noisy.

>> Because of the noise, I can’t study 

22)  The train come late because it was foggy.

>> Because of the fog, The train come late 

23)   The train was late because the fog was thick.

>> Because of the thick fog, The train was late

24)  I can’t sleep because the weather is hot.

>> Because of the hot weather, I can’t sleep

25)  All the teacher love him because his conduct is good.

>> Because of his good conduct, All the teacher love him

26)  Because there was a traffic accident, I went to school late.

>> Because of the traffic accident, I went to school late.

27)  Because there is a  shortage of meet, we had to live on beans.

>> Because of a shortage of meet, we had to live on beans.

28)  Because there was a lack of water, many trees died rapidly.

>> Because of  a lack of water, many trees died rapidly.

29)  She walked slowly because her leg was injured.

>> Because of her injured leg, She walked slowly

30)  Because it was sunny, we decided to go camping.

>> Because of the sunny weather, we decided to go camping.

Viết lại câu:

1, The teacher is sick. We will have no class tomorrow. (because)

-> We will have no class tomorrow because the teacher is sick

2, Son Tung M-TP walked slowly. His leg was injured. (since)

-> Son Tung M-TP has walked slowly since his leg was injured

3, Chipu looked happy. She has just got good mark. (as)

-> Chipu looked as happy as she has just got good mark

4, It got dark. I couldn't read the letter. (because)

-> I couldn't read the letter because it got dark

5, I didn't come in time. There was a traffic jam. (because)

-> I didn't come in time because there was a traffic jam

6, Son Tung M-TP stayed at home yesterday. His mother was sick. (since)

-> Son Tung M-TP has stayed at home yesterday since his mother was sick

7, We didn't want to go out. It rained heavily. (as)

-> It rained as heavy as we didn't want to go out

8, It's raining, so we stay at home. (because)

-> We stay at home because it's raining

9, Most of people hear jogging is a good exercise, so they begin to jog. (since)

-> Most of people have begun to jog since they heard jogging is a good exercise

10, The climate in the country is healthy, so people like to live there. (because)

-> People like to live in the country because the climate is healthy

11, Chipu stayed at home beacause her mother was sick. (because of)

-> Chipu stayed at home beacause of her mother's sickness

12, The plan couldn't take off beacause of the bad weather. (because)

-> The plan couldn't take off because the weather was bad

Viết lại câu:

1, The teacher is sick. We will have no class tomorrow. (because)

=> We will have no class tomorrow because the teacher is sick.

2, Son Tung M-TP walked slowly. His leg was injured. (since)

=> Son Tung MTP walked slowly since his leg was injured

3, Chipu looked happy. She has just got good mark. (as)

=> Chipu looked happy as she has just got good mark.

4, It got dark. I couldn't read the letter. (because)

=> I couldn't read the letter because it got dark.

5, I didn't come in time. There was a traffic jam. (because)

=> I didn't come in time because there was a traffic jam.

6, Son Tung M-TP stayed at home yesterday. His mother was sick. (since)

=> Son Tung MTP stayed at home since his mother was sick.

7, We didn't want to go out. It rained heavily. (as)

=> We didn't want to go out as it rained heavily.

8, It's raining, so we stay at home. (because)

=> We stay at home because it's raining.

9, Most of people hear jogging is a good exercise, so they begin to jog. (since)

=> Most of people begin to jog since they hear jogging is a good exercise.

10, The climate in the country is healthy, so people like to live there. (because)

=> People like to live there because the climate in the country is healthy.

11, Chipu stayed at home beacause her mother was sick. (because of)

=> Chipu stayed at home because of her mother's sickness.

12, The plan couldn't take off beacause of the bad weather. (because)

=> The plan couldn't take off because the weather was bad.

1.Because I was sick, I couldn't go out .(so)

I was sick so I couldn't go out.

2.Lan was tired , so she stayed at home.(because)

Lan stayed at home because she was tired.

3.Let's have a picnic in the park on the weekend

=>Why don't we have a picnic in the park on the weeken?

4.Does your class have twenty-five students?

-> Are there twenty-five students in your class?

5.No house in the street is older than this house.

This house is the oldest house in the street.

6.My father rides his motorbike to work every day.

My father gets to work by motorbile every day.

7.This city is more modern than that city

That city is not as modern as this one.

Ex:Complete the same sentence in different ways:

I was sick...use “because or so” and the words in the box

1.I got wet in the rain

=>i was sick because i got wet in the rain 

2.I couldn’t finish my homework

=>I was sick,so i couldn't finish my homework

3.I didn’t come to class

=>I was sick,so i didn't come to class

4.I stayed up late

=>I was sick because i stayed up late

5.I stayed at home

=>I was sick,so i stayed at home

6.I worked too hard

=>I was sick because i worked too hard

7.I couldn’t go to the cinema with Jim

=>I was sick,so I couldn’t go to the cinema with Jim 

8.I spent so much time playing in the sun 

=>I was sick because I spent so much time playing in the sun 

9.I had to see a doctor

=>i was sick,so i had to see a doctor

10.I took some aspirins

=>I was sick,so i took some aspirins

1. i was sick because I got wet in the rain.

2. i was sick so i couldn't finish my homework.

3. i was sick so i didn't come to class

4. i was sick because i stayed up late.

5. i was sick so i stayed at home.

6. i was sick because i worked too hard.

7. i was sick so I couldn’t go to the cinema with Jim.

8. i was sick because I spent so much time playing in the sun.

9. i was sick so i had to see a doctor.

10. i was sick so i took some aspirins.

1.we didn’t go for a walk because it was raining

It .......was raining so we didn’t go for a walk .........................................................................................................

2.I couldn’t play tennis because my racket was broken

My racket......was broken so I couldn’t play tennis ..........................................................................................................

3.We’re going on a picnic because we have  a long holiday

We....................have  a long holiday so we’re going on a picnic ...........................................................................................

4.Mary was late for school because she missed the bus

Mary...............missed the bus, so she was late for school .................................................................................................

5.Lan failed the exam because she didn’t study hard

Lan.............didn’t study hard, so she failed the exam ...................................................................................................

1.we didn’t go for a walk because it was raining

It ....was raining so we didn't go for a walk.......

2.I couldn’t play tennis because my racket was broken

My racket....was broken so I couldn't play tennis.......

3.We’re going on a picnic because we have  a long holiday

We...have a long holiday so we're going on a picnic

4.Mary was late for school because she missed the bus

Mary....missed the bus so she was late for school

5.Lan failed the exam because she didn’t study hard

Lan........didn't study hard so she failed the exam