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以下是引用JerryGuan在2004-2-22 16:08:00的发言：
as 既可以作介词也可以作连词；而while则只能作连词；本题是考as 作介词的用法，见下列的as 的第4个介词意思。
as / əz strong æz / [prep.]
1
used when you are comparing two people, things, situations etc
as ... as
Tom's not as old as you, is he? an old woman with hair as white as snow Some of the doctors are paid almost twice as much as the nurses. We work as hard as any other team in England.
Please let me know your decision as soon as possible (=as soon as you can) . His last album sold half a million copies and we hope this one will be just as (=equally) popular.
2
used to say what job, duty, use, or appearance someone or something has
As a parent, I feel that more should be done to protect our children. A large flat stone was used as a table. Dad dressed up as Santa Claus.
3
used to say what someone thinks or says a person or thing is
The problem is regarded as serious. The result of last week's election will be seen as a victory for the right-wing government. He's described as being in his late teens, tall, and of slim build.
4
when someone was in a particular age group
As a young man, Eliot had studied art in Paris. I'll take you to all the places I loved as a girl.
as [conj.]
1
used in comparisons
as ... as
They want peace as much as we do. Helen comes to visit me as often as she can. I can't run as fast as I used to.
2
in the way that someone says or that something happens, or in the condition something is in
Do as I say! We'd better leave things as they are until the police arrive. The money was repaid, as promised. He did not need to keep moving house, as his father had. Roberta was late as usual (=in the way that she usually was) .
3
used to say that what you are saying is already known or has been stated before
David, as you know, has not been well lately. As I explained on the phone, your request will be considered at the next meeting. As Napoleon once said, attack is the best method of defence.
4
while or when
I saw Peter as I was getting off the bus. As time passed, things seemed to get worse. Just as the two men were leaving, a message arrived.
5
used to state why a particular situation exists or why someone does something
As it was getting late, I turned around to start for home. We asked Philip to come with us, as he knew the road.
6
though
Unlikely as it might seem, I'm tired too. Try as she might, Sue couldn't get the door open. As popular as he is, the President hasn't always managed to have his own way.
7
as for somebody/something
used when you are starting to talk about someone or something new that is connected with what you were talking about before
Kitty's got so thin. And as for Carl, he always seems to be ill. You can ask the others, but as for myself, I'll be busy in the office.
8
as yet [used in negatives] until and including the present time - used to say that something has not happened although it may happen in the future
We've had no word from Colin as yet.
9
as if.../as though...
a) in a way that makes it seem that something is true or that something is happening
It sounds as though she's been really ill. Gary was behaving as though nothing had happened. Mrs Crump looked as if she was going to explode. Beckworth shook his head as if to say 'Don't trust her'.
b) used to emphasize that something is not true or will not happen
She said she'd never speak to me again. As if I cared (=I do not care at all) .'Don't try any funny business, now.' 'As if I would.' As if! spoken informal He asked if I'd go out with him. As if! (=it is extremely unlikely that I would go out with him)
see usage note as1
10
it's not as if
used to say that something cannot be the explanation for a situation or someone's behaviour because it is not true
Why do they never go on holiday? I mean it's not as if they're poor is it? I don't know why you're so frightened of her, it's not as if she's got any power over you.
11
as it is
a) because of the situation that actually exists - used when that situation is different from what you expected or need
They hoped to finish the kitchen by Friday, but as it is they'll probably have to come back next week.
b) already
Just keep quiet - you're in enough trouble as it is.
12
as from/of something
starting from a particular time or date and continuing
As from today, you are in charge of the office. As of now, there will be no more paid overtime.
13
as against something
in comparison with something
Profits this year are $2.5 million as against $4 million last year.
14
as to something
a) concerning
Frank was very uncertain as to whether it was the right job for him. advice as to which suppliers to approach He kept his rivals guessing as to his real intentions.
b) formal used when you are starting to talk about something new that is connected with what you were talking about before
As to our future plans, I think I need only say that the company intends to expand at a steady rate.
15
as it were
used when describing someone or something in a way that is not quite exact
Jim Radcliffe became our idol, as it were, the man we all wanted to be.
16
as is/was/does etc
formal used to add that what you have said is also true of someone or something else
Eve's very tall, as was her mother. I voted Labour, as did my wife.
while / waɪl / [conj.]
1
during the time that something is happening
They arrived while we were having dinner. While she was asleep, thieves broke in and stole her handbag. She met Andy while working on a production of Carmen.
see usage note during
2
all the time that something is happening
Would you look after the children while I do the shopping?
3
used to emphasize the difference between two situations, activities etc
Schools in the north tend to be better equipped, while those in the south are relatively poor.
4
in spite of the fact that
ￚsynonym althoughWhile never a big eater, he did snack a lot.While there was no conclusive evidence, most people thought he was guilty. 以上解释来自以前的讨论帖子不知道MM是否已看过 http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=1253574&id=17115&page=1&skin=0&Star=1
另外，如果同族词变化词义是完全相同的，那是可以变化的，但是如果释义有区别，那就不可以，所以是否保持词性不变并不极端，而是要试具体情况而定，而大方向是尽量保持。
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发表于 2006-6-6 18:51:00
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