as這個詞的用法很多，可作連詞、關係代詞、介詞、副詞等。下面歸納總結一下它的用法。
26.1 作連詞用 (used as conjunction)
as作連詞用時可表示時間、原因、比較、動作方式與讓步等。
26.1.1 表示時間和原因(of time and reason)
--as they were walking towards the bus stop, it began to rain.
--he came up just as i reached the door.
--she won』t be coming, as we didn』t invite her.
26.1.2 表示比較(in comparison)
--tom is twice as capable as jim.
--it was as pleasant a day as we had ever spent.
--he found riding as tiring as walking.
26.1.3 引導方式與讓步狀語從句(introducing clauses of manner and concession)
--le**e it as it is.
--when in rome, do as the romans do.
--cold as it was, we continued our journey.
--much as i like ice-cream, i never eat much at a time.
26.2 作關係代詞用（used as relative pronoun） | 26.1 | 26.3 | 26.4 | 26.5 | top |
as作為關係代詞用，可以代替乙個名詞，也可以代替乙個句子或一件事情，例如：
--they took in as many people as could be accommodated in the small motel.
--as has been said before, grammar is not a set of dead rules.
--pedro is late, as is often the case.
26.3 作介詞用 (used as preposition) | 26.1 | 26.2 | 26.4 | 26.5 | top |
as作為介詞時是「像……」、「以……身份」、「作為……」、「當作……」之義。
它引導的介詞短語在句中用作賓語補足語或主語補足語。作賓語補足語的例子如下：
--sam took his long days as a matter of course.
--i don』t regard you as being dangerous.
--we think of the wire as disconnected.
常用於這種結構的動詞有：accept, acknowledge, choose, class, classify, consider, declare,
define,denounce, describe, elect, express, interpret, look upon, name, organize, recognize,
refer to, regard,represent, see, take, think of, treat, use, view 等，但是consider不用於此結構。
作主語補足語的例子如下：
--his life as a pilot came to a sudden end.
--the report was thought of as false.
--all his life he worked hard as the only employee in the small grocery.
26.4 作副詞用 (used as adverb) | 26.1 | 26.2 | 26.3 | 26.5 | top |
as做副詞用可表示同等程度、數量、質量等，為「一樣地……」之義。例如：
--paul runs fast, but i run just as fast.
--tom has a lot of money but i don』t h**e as much.
另外as還可用在形容詞或-ed形式詞之前，例如：
--man as different from other animals
--man as described by scientists
26.5 as-短語 (as-phrase) | 26.1 | 26.2 | 26.3 | 26.4 | top |
常見的as-短語及其用法舉例如下：
a. as if, as though（似乎、好象）引導方式狀語從句，從句用過去時:
--he talks as if he knew all about it.
--it isn』t as though he were poor.
b. as for（至於）有時暗示不關心或輕視：
--as for you, i never want to see you here again.
--as for roy, we almost forget him.
c. as to（關於、至於）短語一般放在句首，以加強語氣：
--as to your brother, i will deal with him later.
--as to accepting their demand, it is hard decision to make.
d. such…as引導關係從句：
--such women as knew tom thought he was charming.（認識湯姆的女人都認為他很有魅力）
--such women as tom knew thought he was charming.（湯姆認識的女人都認為他很有魅力）
e. the same…as（同樣）：
--you must show my wife the same respect as you show me.
--we drove out of town by the same road as we had entered by.
f. so as to（以便、足以）：
--he stood up so as to see better.
--it is foolish to beh**e so as to annoy your neighbors.
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