as
1．作介词，表示“作为；当作”。如：
Asapartymember,Imustbestrictwithmyself．
Heworksintheschoolasateacherofmath．
2．作连词，引导方式状语从句，意为“像；按照”。如：
YoumustdoeverythingasIaskedyouto．
3．作连词，引导时间状语从句。意为“当……的时候”。如：Sasshewalks．
HecamejustasIreachedthedoor．
4．作连词，引导原因状语从句。如：
Youmusthurryupasthereislittletimeleft．
5．引导让步状语从句，常用于倒装结构。如：
Hardasheworked,hedidn’tpassthise_amination．
Childasheis,heknowsalot．
6．用作关系代词，引导非性定语从句。如：
Asweallknow,theearthisround．
Shehasbeenlateagain,aswase_pected．
7．用于一些固定搭配。如：
①as．．．as．．．与……相同的程度；与……等同
Thedressistwicease_pensiveasthat．
②asif／asthough似乎；好像
Hebehavedasifnothinghadhappened．
Herubbedhiseyesandyawnedasthoughwakingupafteralongsleep．③aswellas同（一样也）；和；还
OnSunday,hislandladyprovideddinneraswellasbreakfast．
Wecannote_pecthertodothehomeworkaswellaslook
afterthechildren．
④such．．．as像……这样的；suchas例如
Iboughtalotoffruits,suchasapples,oranges,bananasandsoon．Suchsimpleactionsaseating,drinkingbecomedifficult．
⑤asfor至于某人（某事物）
Asforyou,yououghttobeashamedofyourself．
Asforthehotel,itwasveryuncomfortableandmilesawayfromthesea．⑥asto关于某事物；提到某事物
Astocorrectingourhomework,theteacheralwaysmakesusdoitourselves．⑦soasto．．．以便,为了
Shesavedthemoneysoastosupportthefamily．
⑧asamatteroffact其实；实际上
Asamatteroffact,I’mveryfondofhousework．
⑨asaresult结果(发生某种情况)
Asaresult，hehadbeengivenane_cellentjob．
⑩aslongas只要
Aslongasyouworkhard,youwillsucceedsoonerorlater．