- Jim had to give up jogging because he had sprained his ankle severely.
- The water in most rivers is unsafe to drink because it's polluted.
- We had to stay in London an extra day because it was foggy at the airport.
- Bill has to do all of the cooking and cleaning because his wife is ill.
- We all have received the best of everything because our parents are generous.
- I couldn't get to sleep last night because it was noisy in the next apartment.
- John has to sit in the front row in class because he has poor eyesight.
- We stopped our car because the traffic lights turned red.
- She couldn't see the road because the wall was too high.
- We postponed our trip because the driving conditions were bad.
- Sarah will not walk across a bridge because she's afraid of heights.
- Mark's doctor has advised him to exercise regularly because he is overweight.
- Piranhas can devour an entire cow in several minutes because their teeth are extremely sharp.
- Most students couldn't do the final exam because it was extremely difficult.
- John succeeded in his exam because he worked hard and methodically.
IV. Change clauses of reason to phrases of reason.
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