Don't you smoke until the plane __ off.A takes b has taken 为什么不选A,Don't you smoke until the plane __ off.A takes b has taken 为什么不选A,一般现在时表示将来不是吗,为什么选b啊
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Don't you smoke until the plane __ off.A takes b has taken 为什么不选A,
Don't you smoke until the plane __ off.
A takes b has taken 为什么不选A,
一般现在时表示将来不是吗,为什么选b啊
一般现在是表将来是可以的,比如说,有come,go,arrive,leave,start,begin,return等词,有明确时间规定的.如:The train leaves at six tomorrow morning.
或是用在主将从现的时间或条件状语的句子中.
可don't you somke 你不能把它看成将来时是吧,根据语境,完成时的使用,表示将来某个动作之前已完成.
因为它说直到起飞之后才准吸烟,这是现在完成时用在时间或条件状语从句中,用来表示将来某个动作之前已经完成的那个动作。
懂了么?
比如don't get off the car until it has stopped.一般现在时表示将来也好像没有错啊,虽然我也知道是现在完成表将来完成时 不过还是不明白这两者区别在哪里...
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因为它说直到起飞之后才准吸烟,这是现在完成时用在时间或条件状语从句中,用来表示将来某个动作之前已经完成的那个动作。
懂了么?
比如don't get off the car until it has stopped.
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