the boy had run away__i could ask him some questionbefore 为什么不是when

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theboyhadrunaway__icouldaskhimsomequestionbefore为什么不是whentheboyhadrunaway__icouldaskhimsomequestionb

the boy had run away__i could ask him some questionbefore 为什么不是when
the boy had run away__i could ask him some question
before 为什么不是when

the boy had run away__i could ask him some questionbefore 为什么不是when
before 还没来得及.就.

时态啊
前面用的是过去完成时,就是说明这个动作发生在过去之前
后面是过去时,那介词也就只能是before咯,才能表现出前面的动作发生在后面的动作之前啊

因为是过去完成时had run "他当时已经跑了"
如果人都不在了,你见他怎么问啊,呵呵...

男孩在我要问问题前逃跑
而我们不会说成男孩逃跑当我要问问题时

the boy had run away
说明在他没问之前这BOY就跑了.

用逻辑思维来考虑,不要单从意思上想当然~你会发现before更确切!

你看一下时态啊,前面主句的时态是过去完成时,而后面从句只是一般过去时,所以前面时态先于后面动作的完成,所以用before