必修二 Unit3 课文内容
1.I developed very slowly and it took nearly two hundred years before I was built as an analytical machine by Charles Babbage.
△ before引导时间状语从句
高中英语课文before引导时间状语从句时可以根据语境译作“过了……〔时间〕才……”，“还没来得及……就……”或“在……之前”。
They walked about 30 miles before they saw a village.
We hadn’t run a mile before he felt tired.
△ before常用于以下句型中：
It was + 时间段 + “过了……才……”，从句常用一般过去时。
It was not long before ... “不久就……”，从句常用一般过去时。
It will not be “不久就会……”，从句常用一般现在时。
It will be + 时间段 + “要过……才……”，从句常用一般现在时。
It was five days before he came back.
It was not long before he sensed the danger of the position.
It will not be long before they understand each other.
It will be half a year before you graduate from the school.
练习：
1. It was evening ______ we reached the little town of Winchester.
A. that B. until C. since D. before
2. 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
3. Someone called me up in the middle of the night, but they hung up ______ I could answer the phone.
A. as B. since C. until D. before
4. He made a mistake, but then he corrected the situation ______ it got worse.
A. until B. when C. before D. as
5. It was some time _____ we realized the truth.
A. when B. until C. since D. before
6. The American Civil War lasted four years _____ the North won in the end.
A. after B. before C. when D. then
7. –Why didn’t you tell him about the meeting?
–He rushed out of the room _____ I could say a word.
A. before B. until C. when D. after
8. –How long do you think it will be______ China sends a manned spaceship to the moon?
–Perhaps two or three years.
A. when B. until C. that D. before
2.Anyhow, my goal is to provide humans with a life of high quality.
本句为简单句。my goal为主语；动词不定式短语为表语；of high quality作定语，修饰a life.
△ “of + 名词”结构
“of + 名词”结构可在句中作表语、定语和补语。该结构可分为两类：
名词有相应的形容词时，“of + 名词”可转化为相应的形容词。这类名词有value, use, important, help, interest, benefit等。它们可用no, some, any, little, much, great等词修饰。
They are of great help ( = very helpful) to English learners.
In fact, sports can be of great benefit (=very beneficial) to our health.
名次没有相应的形容词时，“of + 名词”没有相应的形容词形式。常见的名词有age, size, color, weight, quality, height, price, opinion, shape, kind, way等，这些名词前的限定词常为a, an, the same等。
Mr. Smith, my teacher, is of the same opinion.
We are of the same age.
Tom is of a different way of thinking.
练习：
– This book by Tony Garrision is ______ for our course.
– But I think his latest one is better worth reading.
A. useless B. of no use C. of great use D. great useful
完成句子
这项工程对每个人都大有好处。
This project is ______________________________ (benefit) to everyone.
同时，性别差异的主题也很有趣。
Also, the topic of sex differences is ____________________________ (interest).
在这个地区，我们学校的教学质量是最好的。
Our school education is ________________________ (quality) in this area.
3.As time sent by I did research into how to make my radio.
本句中as time sent by为as引导的时间状语从句，how to make my radio作介词into的宾语。
△ as引导的时间状语从句
as引导时间状语从句，意为“随着，当……”，强调主从句的谓语动作同时发生。
As shots rang, people could be seen running out of the building.
as引导比较状语从句，意为“像……一样”。
He is as old as I (am).
as引导方式状语从句，意为“照……的方式”。
When in Rome, do as the Romans do.
as引导原因状语，意为“因为，由于”。”
As she has no car, she can’t get there easily.
as引导让步状语从句，意为“尽管，虽然”，此时从句需用部分倒装结构。
Happy as/though they were, there was something missing.
Child as/though he is, he knows a lot.
练习：
Stupid ______ it sounds, I was so in love with her that I believed her.
A. although B. as C. while D. when
Lessons can be learned to face the future, _______ history cannot be changed.
A. though B. as C. since D. unless
完成句子
我们最好快一点，因为天就要黑了。
We had better hurry, _________________________________________.
尽管她已经很累了，但她想睡觉是没有指望的。
___________________________________, there was no hope of her being able to sleep.
详细的调查显示多达50%的病人没有遵照指示服药。
Careful surveys have indicated that as many as 50% of patients do not take drugs ____________________________. (direct)
发布评论