I arrived at the airport ____ the plane had taken off

I arrived at the airport ____ the plane had taken off
为什么一定要用after?而不能用when或者before?

所谓的疯子 1年前已收到5个回答举报

雪中菲0099 幼苗

共回答了16个问题采纳率：93.8% 举报

此句意为：我到达飞机场的时候,飞机已经起飞了.
飞机先起飞,之后我到达,因此用after.
when后面不可加完成时态；
如果用before,后面就应该是一般过去时took off.

1年前

2008jlj 幼苗

共回答了22个问题举报

after 引导从句时，从句要用虚拟语气，就是把原来的时态往后退一个！所以选after！

1年前

58000 幼苗

共回答了7个问题举报

这个句子后面有完成时had taken off，完成时可表示对现在有影响的事情。用after，译为“我在飞机飞走之后才到达机场”，所以我无法赶上飞机，对现在有影响。
如果用when，是不是用was taking off更好呢？如果用before，则直接用took off会更好。所以这里最好使用after。
另外就是靠语感了。...

1年前

sindyjia 幼苗

共回答了28个问题举报

had taken off是过去完成时，不是一个时间点而是一个时间段。
因此when不行。由于它是过去完成时，而前半段是一般过去时，所以before也不可以。

1年前

女人要有一点坏1 幼苗

共回答了14个问题举报

WHEN一定不对，因为是一个时间差的问题，你没有上下文，不能判断用AFTER还是BEFORE.

1年前

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