- While I was doing my homework, my brother was watching TV.
- He met an old friend while he was taking a walk in the park.
- Where were you while I was reading the book?
- He learned a lot of things while he was in France.
- Let's wait here until she comes back.
- We have to study hard until they pass the examination.
- I have to stay at home until my mother come back.
- Although the stone was very heavy, he tried to remove it.
- Though she was very tired, she practiced the violin.
- Although it was very late, I decided to go out.
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