They didn't tell me when to set off.
他们没告诉我什么时候动身。
They clashed over the question of when they would set off.
他们在何时出发的问题上意见有分歧。
When all the birds had gathered together, they all set off together.
所有的鸟儿都到齐后，他们就出发前往了。
他们什么时候动身的？
When we reached there , they had set off.
翻译为：当我们到达那里时，他们已经出发了。
When we reached there , they had set off.
翻译为：当我们到达那里时，他们已经出发了。
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