注意1：as引导的介词短语大多用作状语，as译为"作为"，少数情况可引起宾语补足语。例如:
As a Party member, I'll take the lead in everything. (状语)
She works as a nurse. (状语)
Tom has me as one of his best friends. (引起宾语补足语)
注意2：as和like都可以作介词，但意义不同。as表示“以实际的身份或地位”。 like则表示“与…相似，以与…相类似的方式”。例如：
(1). He spoke as a teacher.
(2). He spoke like a teacher.
句(1)的意思是：“他作为老师发言”或“他以老师的身份发言”。句(2)的意思是：“他讲话很像是老师”。
五、用于一些固定搭配
1. as good as差不多，几乎
Don’t worry, the matter’s as good as settled. 别担心，问题差不多已经解决了。
When the car was repaired, it looked as good as new. 这辆汽车修理好的时候，看起来差不多就像新的一样。
2. as if /as though 似乎;好像
He behaved as if nothing had happened. 他装着若无其事的样子。
She treats him as though he was her own son. 她待他好像待自己的儿子一样。
另外，as if可以接一个动词不定式短语。例如：
He waved his hand to me as if to have something to tell me. 他向我挥手好像有什么要告诉我。
3. as well as 同(一样也);和;还
Joan can speak Chinese as well as English. 琼能讲英语还能讲汉语。
He spent all his money, as well as wasting his time. 他不仅浪费了时间，还花光了他所有的钱。
4. such...as, such as 像……这样的
I bought a lot of fruits, such as apples, oranges, bananas and so on. 我买了许多种水果，像苹果，桔子，香蕉等。
We had such books as you never saw. 我们有一些你从未看过的书。
5. as for 至于某人(某事物)
We had a delightful weekend in the country. As for the traffic, we had no difficulty. 在乡下我们度过了一个愉快的周末。至于交通，我们没遇到任何困难。
6. as to 关于某事物;提到某事物
I don't know anything as to the others. 至于其他，我一无所知。
7. so as to ... 以便, 为了
Students should take notes so as to make revision easier. 学生应当记笔记，以便容易复习。
8. as a matter of fact 其实;实际上
As a matter of fact, I’m very fond of housework. 其实，我很喜欢做家务。
9. as a result 结果 (发生某种情况)
As a result， he had been given an excellent job. 结果，他得到了一份极好的工作。
10. as long as 只要
You may borrow this book as long as you promise to give it back. 只要你答应归还，你就可以把这书借走。
总之，通过以上的分析，我们对as的词性和用法有了比较全面的理解和把握，才能在实际的运用中做到心中有数，应付自如。
巩固练习
1. She had a tense expression on her face, ________she were expecting trouble.
A. even though B. even as C. as though D. now that
2. A good many proposals were raised by the delegates, ________was to be expected.
A. that B. what C. so D. as
3. ________might be expected, the response to the question was very mixed. A. As B. That C. It D. What
4. Americans eat ________as they actually need every day.
A. twice as much protein B. twice protein as much
C. twice protein as much D. protein as twice much
5. The trumpet player was certainly loud. But I wasn't bothered by his loudness ________by his lack of talent.
A. than B. more than C. as D. so much as
6. Studies show that the things that contribute most to a sense of happiness cannot be bought, ________a good family life, friendship and work satisfaction.
A. as for B. in view of C. in case of D. such as
7. ________he works hard, I don't mind when he finishes the experiment. A. As soon as B. So far as C. As well as D. As long as
8. ________the danger from enemy action, people had to cope with a severe shortage of food, clothing, fuel and almost everything.
A. As long as B. As far as C. As soon as D. As well as
Key: 1-5 CDAAD 6-8 DDD
高考真题直练
1. It is generally believed that teaching is ______it is a science.
A. an art much as B. much an art as
C. as an art much as D. as much an art as
2. She doesn't speak ______her friend, but her written work is excellent.
A. as well as B. so often as C. so much as D. as good as
3. The piano in the other shop will be ______, but ______.
A. cheaper; not as better B. more cheap; not as better
C. cheaper; not as good D. more cheap; not as good
4. After supper she would sit down by the fire, sometimes for ______an hour, thinking of her young and happy days.
A. as long as B. as soon as C. as much as D. as many as
5. With the help of the German experts, the factory produced ______ cars in 1993 as the year before.
A. as twice many B. as many as twice
C. as twice as many D. twice as many
6. After the new technique was introduced, the factory produced______ tractors in 1988 as the year before.
A. as twice many B. as many twice C. twice as many D. twice many as
7. ______, he doesn't study well.
A. As he is clever B. He is as clever C. Clever as he is D. As clever he is
8. ______, he was unable to make much progress.
A. Hard as he try B. Hard as he tried
C. As he tried hard D. He tried hard
9. Tom kept quiet about the accident ________ lose his job.
A. so not as to B. so as not to C. so as to not D. not so as to
10. When a pencil is partly in a glass of water, it looks as if it ______.
A. breaks B. has broken C. were broken D. had been broken
11. ________ is known to everybody, the moon travels round the earth once every month.
A. It B. As C. That D. What
12. ________ is known to all, China will be an ________ and powerful country in 20 or 30 years' time.
A. That; advancing B. This; advanced C. As; advanced D. It; advancing
13. He doesn't believe ________things ________ you do.
A. the same; as B. the same; with C. as same; as D. as same; with
14. ________ is mentioned above, the number of the students in senior high schools is increasing.
A. Which B. As C. That D. It
Key: 1-5 DACAD 6-10 CCBBC 11-14 BCAB