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- 你何时去交易会？明天还是另找哪一天？
When will you go to the Fair, tomorrow or some other day?
- 你知道火车何时开吗？
Do you know when the train will leave?
- 你猜飞机何时要起飞？
When do you guess the airplane will take off?
- 这项法律何时生效？
When will the law take effect?
- 你何时开始学习英语的？
When did you begin learning English?
- 这项新法律何时生效？
When does the new law come into operation?
- 新制度何时生效？
When does the new system become effective?
- 你的驾驶执照何时到期？
When does your driving licence expire?
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