I was out of town at the time ,so I don't know exactly how it _______.为什么用 happened 而不是 has happened?现在完成时不能用在过去吗 我一直没有弄清楚! 请详细告诉我一下 谢谢了

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I was out of town at the time ,so I don't know exactly how it _______.为什么用 happened 而不是 has  happened?现在完成时不能用在过去吗 我一直没有弄清楚! 请详细告诉我一下 谢谢了
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为什么用 happened 而不是 has happened?
现在完成时不能用在过去吗 我一直没有弄清楚! 请详细告诉我一下 谢谢了

I was out of town at the time ,so I don't know exactly how it _______.为什么用 happened 而不是 has happened?现在完成时不能用在过去吗 我一直没有弄清楚! 请详细告诉我一下 谢谢了
现在完成时顾名思义,到现在已经完成了.它有两层含义1一个动作动过去开始发生一直发生到现在2或是过去发生的动作对现在造成的影响(比如说考试没考好现在郁闷啊),他是将过去与现在相连接的时态.你们看到它叫做现在完成时,强调的主要是现在.一般过去时就是指过去发生了一个动作,比较单纯了.
现在咱们来分析一下这道题.我当时不再小镇,所以我不清楚他是怎么发生的.I don't know exactly 后面放了一个宾语从句.这件事就是他是怎么发生的,这件事发生在过去我没在小镇的时候,用个一般过去就行了.

happen是短暂性动词,不可用完成时
现在完成时
现在完成时(Present perfect)过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。
 5. 现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.  We have had four texts this semester.

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happen是短暂性动词,不可用完成时
现在完成时
现在完成时(Present perfect)过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。
 5. 现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.  We have had four texts this semester.
  6.现在完成时的"完成用法"
  现在完成时的"完成用法"指的是动作发生在过去某一时刻并已结束,但该动作对现在产生了影响,与现在情况具有因果关系。
  例如:He has turned off the light.他已把灯关了。(动作结束于过去,但说明的是现在的情况--灯现在不亮了。)
  现在完成时"完成用法"的特点是动作不延续,因此,该时态只能与表示不定的过去时间状语(如:already,yet,before,recently等)、频度时间状语(如:never,ever,once等)、包括现在时刻在内的时间状语(如:this morning / month /year...,today等)连用。
  例如:Have you found your pen yet?你已找到你的钢笔了吗?
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它怎么发生的,强调how,过去时。how后不能跟完成时。。

你好:
这个要根据具体的语境 你看这道题 前面说 那时候我不在镇上 后面就着重说明 我不知道当时具体放生了什么 主要是针对这件事情 所以采用过去时

I was out of town at the time ,so I don't know exactly how it ___.A was hapening B.happened为啥选 B I was called out of town to our office this week.求助这句话的中文翻译 I’m from out of town I was out of town at the time ,so I don't know exactly how it _______.为什么用 happened 而不是 has happened?现在完成时不能用在过去吗 我一直没有弄清楚! 请详细告诉我一下 谢谢了 用come about,happen,take place,break out,occur的正确形式填空1.I was out of town at the time ,so I don’tknow exactly how it ______ 2.The meeting _________ at 8:00 as planned 3.It________ to rain that morning 4.A fire _________ in the hotel l 1.I was out of town at the time,so I don`t know exactly how it____.A.was happening B.happened C.happens D.happen2.John was given the same suitcase his father and grandfather ___with them to school.A.took B.had taken C.were taking D.would take3.—Is out-of-town previews是什么意思 Get Out Of Town 歌词 I was alone because my parents were out of the town.这个句子哪里出错了啊?谢谢各位高手相助. 求翻译I WENT out into the world as “shop-boy” at a fashionable boot-shop in the main street of the town. Can you come at once to a place out of the town?It is quite far but you have a car and I can show One night a young American doctor was sleeping at home when his doorbell began to ring.One night a young doctor was sleeping when his doorbell ring.“Can you come to a place out of town.I’ll come soon.” 38 a few minutes,the car came.The man got I Was Out Of My Mind 歌词 I was bored out of my mind. I was a little out of my 关于happen的英语选择题I was out of town at that time,so I didn't know exactly how it __________.A.happenB.had happenedC.happensD.has happened我选了B,但是我觉得应该是happened(选项里没有),求解为什么不是happened i was born in a small mountain town,i moved to the city of Los.mountain town ,the city of To my surprise,all of the salt was s() out in our town