Because introduces a reason, while so introduces a result. This exercise practices identifying which part of a sentence explains the cause and which part describes what happened as a consequence.
Choose the correct answer for each sentence, then click Check answers to see how you did.
1. James didn't do his homework ___________ he was tired.
Correct answer: because
2. My friend had to cancel our lunch date, ___________ I ate alone.
Correct answer: so
3. He was already pretty upset, ___________ I didn't tell him the bad news.
Correct answer: so
4. He was hired ___________ he spoke German.
Correct answer: because
5. I really liked his last book, ___________ I'm going to buy his new one.
Correct answer: so
6. Robert didn't complain ___________ he knew that it wouldn't change anything.
Correct answer: because
7. He fell in love with her ___________ she was a good person.
Correct answer: because
8. He fell in love with her, ___________ he bought her flowers every day.
Correct answer: so
9. She stopped eating meat ___________ she loved animals.
Correct answer: because
10. He was expecting to fail the test, ___________ he was surprised when he passed.
Correct answer: so
11. I didn't call my brother ___________ I was working.
Correct answer: because
12. We stopped ___________ my mom could buy some water.
Correct answer: so
13. Charlotte found out, ___________ she got really upset.
Correct answer: so
14. Peter failed his exam ___________ he didn't study.
Correct answer: because
15. David was planning to travel to Germany, ___________ he decided to take German lessons.
Correct answer: so
16. It was really hot outside, ___________ we went swimming in a nearby lake.
Correct answer: so
17. I stayed at home ___________ my mom made me.
Correct answer: because
18. Q: Did you move to Denver because of the weather? A: No, I moved to Denver ___________ I got a job there.
Correct answer: because
19. Amelia couldn't tolerate her loud neighbors, ___________ she moved out.
Correct answer: so
20. I'm going on a diet, ___________ I'll probably be grumpy for the next two weeks.
Correct answer: so
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Grammar review BECAUSE
Shows the reason for something.
Structure: Result → because → Cause
Example: I stayed home because it was raining.
(Result: stayed home; Cause: rain)
SO
Shows the result of something.
Structure: Cause → so → Result
Example: It was raining, so I stayed home.
(Cause: rain; Result: stayed home)