Only sentence 3 is about the future.
Why?
Look at the sentences again.
 
1 When he was only six years old he could swim pretty well.
2 Because he worked so hard he was able to pass the examination.
3 Do you think he could pass the examination?
4 Do you think he was able to pass the examination?
5 When I was on holiday I could get up whenever I liked.

See if you can match the meanings to the sentence in the next exercise.

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