有关before的高考题
- 提问者网友：王者佥
- 2021-05-22 08:40
- 五星知识达人网友：woshuo
- 2021-05-22 09:28
请先看下面三道高考题:
1. Scientists say it may be five or six years ________ it is possible to test this medicine on human patients.
A. since B. after C. before D. when
2. It was evening ________ we reached the little town of Winchester.
A. that B. until C. since D. before
3. Several weeks had gone by ________ I realized the painting was missing.
A. as B. before C. since D. when
这三道题均考查before的用法,答案分别为C,D,B。before的用法既是中学英语学习中的重点与难点,同时又是高考命题的热点。现就其用法归纳说明如下:
I. before作介词用
1. 表示"在......之前"、"在......前面"、"当着......的面"、"先于......",后面接名词或代词,表示位置或次序。例如:
You will never bow before difficulties. 你们决不能向困难低头。
It's always quiet before a storm. 暴风雨来临之前总是平静的。
His name comes before mine on the list. 名单上他的名字在我的前面。
Those with babies go into the bus before others. 带小孩的人比别人先上公共汽车。
2. 表示"在......以前",后面接名词,表示时间,但不能与表示一段时间的词连用。例如:
The darkest hour is before the dawn. 最黑暗的时间过去了就是黎明。
You must come to my office before ten o'clock. 你必须在十点钟以前来我办公室。
II. before作副词用
1. 表示"向前"、"在前面",表示位置或方向。例如:
I went before to see if the road was safe. 我走上前去看路是否安全。
2. 表示"以前",作时间状语。谓语用一般过去时,表示动作发生在过去;谓语用现在完成时,强调动作对现在的影响。例如:
I saw that film before. 那部电影我以前看过。
I've seen that film long before. 我早就看过那部电影了。
III. before作连词用
1. 表示"在......之前",引导时间状语从句,可放在主句之前或之后,但通常不用于一般将来时。例如:
Do it now before you forget. 现在就做,免得你忘了。
I had read the operation instruction before I began to test the machine. 开始试验该机器之前,我已看过操作说明书了。
2. 表示"过了多久才......"、"......之后才......",常用于"It is (will be, was...) + 时间段 +before +S. + V. +..."句型。例如:
It will be three years before we meet again. 三年之后我们才能再见面。
3. 表示"不多久......就......",常用于"It is(was) not +时间段 +before +S. + V. +..."句型。例如:
It wasn't long before she told me about the affair. 过了不多久她就把这件事告诉我了。
4. 表示"不等......就......"。例如:
Before I could get in a word he had measured me. 不等我插话,他已经给我量好了尺寸。
5. 表示"先......再......"。例如:
Be a pupil before you become a teacher. 先做学生,再做先生。
6. 表示"宁可......也不......"。例如:
He will die of hunger before he steals. 他宁可饿死也不去偷。