Because is a subordinating conjunction. It shows the cause.So is a coordinating conjunction. It shows the effect.
We can combine two clauses using because and so.
Study the example given below.
Susie didn’t attend the party. She was not invited.
We can combine these two clauses in two different ways.
Susie didn’t attend the party because she was not invited.
Susie was not invited, so she did not attend the party.
1He was lazy, ............... he did not study well.
Wrong!
Use "so" before the result of being lazy.
2I could not talk to him ............... he was busy.
Wrong!
Use "because" before the reason he could not talk to him.
3He was ill, ............... he did not attend school for a week.
Wrong!
Use "so" before the result of being ill.
4He was sick, ............... they took him to hospital.
Wrong!
Use "so" before the result of being sick.
5The teacher asked him to go out ............... he misbehaved in class.
Wrong!
Use "because" before the reason the teacher asked him to go out.
6We left the windows open ............... it was warm.
Wrong!
Use "because" before the reason we left the windows open.
Done.
Score: 0/6
Answers
- He was lazy, so he did not study well.
- I could not talk to him because he was busy.
- He was ill, so he did not attend school for a week.
- He was sick, so they took him to hospital.
- The teacher asked him to go out because he misbehaved in class.
- We left the windows open because it was warm.

