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through 可以作介词，作副词，也可以作描述词。
一、through 作介词
1、用来暗指从某物的一个方位到另外一个方位，一般是某物的两端，意为“从…一端至另一端；穿过，贯穿”，例
如：
You have to go through the forest to get to the village.
你有必要穿过森林才干抵达村庄。
解析：此句说话人运用through来阐明你有必要从森林的一端穿到森林的另一端。
2、用来给出方法或缘由，意为“以，凭仗；因为，因为”，例如：
You can only achieve success through hard work.
你得孜孜不倦方能成功。
It is through your own fault that you lost this opportunity.
你失掉这个机缘是因为你自个的差错。
The accident happened through no fault of mine.
事端不是我的错。
3、用来标明经过妨碍、期间或查验，意为“穿过，经过”，例如：
It was through great difficulty that we finally achieved this.
咱们是经过极大的困难才究竟抵达这一意图的。
First you will have to go through an exam.
首要你得经过考试。
此意可以延伸为某事现已结束，意为“结束”，例如：
Finally, we are through with all the exams.
最终，咱们结束了一切的考试。
4、用来指示从
一个活动，一种情况或是一段时刻的初步到结束，意为”自始至终；自始至终“，例如：
The children are too young to sit through a concert.
这些孩子太小，音乐会没完就坐不住了。
He will not live through the night.
他活不过今日夜里了。
二、through 作副词
1、意为”从一端到另一端；经过“，例如：
Conductors let electricity through, but insulators don't let through.
导体让电流转过，而绝缘体则不让经过。
The flood was too deep to drive through.
洪水太深，轿车开不曩昔。
2、意为”自始至终；自始至终“，例如：
Don't tell me how it ends─I haven't read it all the
way through yet.
先别告诉我书的结束，我还没有看完呢。
I expect I'll struggle through until payday.
我想我会挨到发薪日的。
3、意为”接通“，例如：
He may find the line cut on the telephone so that he can't get through.
他可以会发现电话线被堵截了，所以打不通。
I rang him several times this morning but could not get through to him.
上午我给他打了几回电话，但都没打通。
4、意为”直达，径自“，例如：
This train goes straight through to York.
这列火车直达约克。
You can check your baggage right through to its final destination.
你可以把行李直接邮递到结束。
5、意为”经过…“，一般是妨碍、期间或查验等，例如：
The lights were red but he drove straight through.
红灯亮着
，但他开车闯了曩昔。
6、用于描述词后，意为”完全，完全“，例如：
We got wet through.
咱们浑身上下都湿透了。
I returned to the inn cold and wet, soaked through by the drizzling rain.
我回到小旅馆时身上被毛毛雨淋透了，感触又冷又湿。
三、through 作描述词
1、用来标明线路或道路直通的，意为“直达的，直通的”，例如：
The village lies on a busy through road.
那村庄位于在一条繁忙的直达公路上。
This is my first journey by the through train to Guangzhou.
这是我初度乘直达车去广州。
2、（运用）结束，结束；（联络）了断，阻隔
Are you through with that newspaper?
你看完那份报纸了吗？
I'm through with the explaining.
我不想再说明了。
It would be only a matter of time before he went through with it.
他结束这件事只是时刻疑问。
Todd and I are through.
托德和我吹了。
