高中英语人教版必修二-Unit3-课文内容

高中英语人教版必修二-Unit3- 课文内容．

Unit3 课文内容必修二I developed very slowly and it took nearly two 1.

an was built as hundred years before I

analytical machine by Charles Babbage.

本句是由并列连词and连接的并列句。and 后的句子中before引导时间状语从句。

△ before引导时间状语从句

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：

⑴ It was + 时间段 + before... “过了……才……”，从句常用一般过去时。

⑵ It was not long before ... “不久就……”，从句常用一般过去时。

⑶ It will not be long before... “不久就会……”，从句常用一般现在时。

⑷ It will be + 时间段 + before... “要过……，从句常用一般现在时。才……”

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.

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.

D. before

Anyhow, my goal is to provide humans with a 2.life of high quality.

本句为简单句。my goal为主语；动词不定式

短语to provide...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：

⑴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.

⑵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。