1. Because

2. so

3. as

4. Because of

5. Since

Ex 2:

1. Paul was an hour late becaus he missed the train.

2. I borrowed your lawn mower as you weren’t using it.

3. We had no electricity during the storm so we had to use candles.

4. He studied hard for the test since he needed a good mark.

5. We have decided to stay at home as it's raining.

6. Tom won’t be able to go with us to the theatre because he has to work.

7. The windows were all open. Consequently, a lot of mosquitoes came into the room.

8. We knew what to expect. Therefore, we were not surprised at what happened.

9. He asked nicely since you would consider it.

10. Mary joined the school theatre as she wanted to increase her circle of friends.

11. I’ll take a taxi as I don’t know the way.

12. I can’t read my email as I´ve forgotten my password.

13. I got home late because of a flight delay. 

Ex 3:

1. Sue didn’t put on her sweater after the race so she got a cold.

2. I turned the heating on since it was very cold.

3. The lamp didn’t work so I took it back to the shop.

4. Dave doesn’t drive because he always travels by train.

5. Would you mind picking up some trash bags as you are going by the store on the way home from work?

Exercise 1:   Because of – so - because – since – as 
1. Because it was dark and rainy, I couldn’t see the road signs well. 
2. The kitchen was flooded, so we had to go to a restaurant. 
3. I can’t lend you any money as I don´t have any. 
4. Because of severe weather, the flight was delayed. 
5. Since  we don’t have to study today, let’s go to a picnic. 
Exercise 2: Rewrite the sentences using the connector given in brackets. 
1. Paul was an hour late. He missed the train.     (because) 
=> Paul was an hour late becaus he missed the train.
2. I borrowed your lawn mower. You weren’t using it.    (as) 
=>I borrowed your lawn mower as you weren’t using it.
3. We had no electricity during the storm. We had to use candles.  (so) 
=>We had no electricity during the storm so we had to use candles.
4. He needed a good mark. He studied hard for the test.   (Since) 
=> He studied hard for the test since he needed a good mark.
5. It’s raining. We have decided to stay at home.    (As) 
=> We have decided to stay at home as it's raining.
6. Tom won’t be able to go with us to the theatre. He has to work.  (because) 
=>  Tom won’t be able to go with us to the theatre because he has to work.
7. The windows were all open. A lot of mosquitoes came into the room. (Consequently)
=> The windows were all open. Consequently, a lot of mosquitoes came into the room.
8. We knew what to expect. We were not surprised at what happened. (Therefore) 
=> We knew what to expect. Therefore, we were not surprised at what happened.
 9. Would you consider it? He asked nicely.     (since) 
=>  He asked nicely since you would consider it.
10. Mary joined the school theatre. She wanted to increase her circle of friends. (as)
=> Mary joined the school theatre as she wanted to increase her circle of friends.
11. I don’t know the way. I’ll take a taxi.     (as)
=>   I’ll take a taxi as I don’t know the way.
12. I´ve forgotten my password. I can’t read my email.    (so) 
=>  I can’t read my email as so I´ve forgotten my password.
13. I got home late. There was a flight delay.     (because of) 
=> I got home late because of a flight delay. 
Exercise 3: Rewrite the sentences, using a suitable connector. (Nối 2 câu lại với nhau sử dụng 1 từ nối phù hợp.)
1. Sue didn’t put on her sweater after the race. She got a cold. 
=> Sue didn’t put on her sweater after the race so she got a cold.
2. I turned the heating on. It was very cold. 
=> I turned the heating on since it was very cold.
3. The lamp didn’t work. I took it back to the shop. 
=> The lamp didn’t work so I took it back to the shop.
4. He doesn’t drive. Dave always travels by train. 
=>Dave doesn’t drive because he always travels by train.
5. You are going by the store on the way home from work. Would you mind picking up some trash bags?
=> Would you mind picking up some trash bags as you are going by the store on the way home from work?