when did it happen和 when has it happend?有什么区别when did it happen?when has it happened?有什么区别,具体要怎么翻译?一个是一般过去时,一个是过去完成时,这两种时态之间又有怎样的相同点和不同点?

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whendidithappen和whenhasithappend?有什么区别whendidithappen?whenhasithappened?有什么区别,具体要怎么翻译?一个是一般过去时,一个是过去

when did it happen和 when has it happend?有什么区别when did it happen?when has it happened?有什么区别,具体要怎么翻译?一个是一般过去时,一个是过去完成时,这两种时态之间又有怎样的相同点和不同点?
when did it happen和 when has it happend?有什么区别
when did it happen?
when has it happened?
有什么区别,具体要怎么翻译?
一个是一般过去时,一个是过去完成时,这两种时态之间又有怎样的相同点和不同点?

when did it happen和 when has it happend?有什么区别when did it happen?when has it happened?有什么区别,具体要怎么翻译?一个是一般过去时,一个是过去完成时,这两种时态之间又有怎样的相同点和不同点?
一般过去时强调过去的事实,has it happened是现在完成时,而不是你说的过去完成时,它强调过去发生的是对现在的影响或结果.

我觉得语法本来就有问题把
怎么能用现在完成时那

完成时是指与现在有连系的，过去时指发生在过去的，这个问法一般用过去的吧，完成的很少看到啊

现在完成时通常表示在说话之前已经完成的动作或存在的状态。说话人强调的是该动作或状态对现在的结果或影响。而一般过去时也表示动作已经完成，但强调的是过去发生了某一动作这样一个事实。有的同学觉得这种说法比较难以理解，因为任何过去的动作对现在都有影响，很难判断用一般过去时或现在完成时。事实上，这种说法没有把现在完成时与一般过去时的根本区别说清楚。
如果没有说明动作发生的具体时间，则一般用现在完成时...

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现在完成时通常表示在说话之前已经完成的动作或存在的状态。说话人强调的是该动作或状态对现在的结果或影响。而一般过去时也表示动作已经完成，但强调的是过去发生了某一动作这样一个事实。有的同学觉得这种说法比较难以理解，因为任何过去的动作对现在都有影响，很难判断用一般过去时或现在完成时。事实上，这种说法没有把现在完成时与一般过去时的根本区别说清楚。
如果没有说明动作发生的具体时间，则一般用现在完成时；如果说明了动作发生的具体时间，带有表示过去的时间状语，则用一般过去时。

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