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as可以作連詞、介詞及關系代詞和副詞。現將其用法小結如下: （一）、 as作連詞的用法: 1.作“在-------期間，當----的時候”引導時間狀語從句.注意與when、 while的用法區別。 ①下列情形時,只用as, 而不用when或while。 1)用于表示同一個人的兩種動作交替進行,指一邊----一邊. 如: The girl sings as she goes to school. He looked behind occasionally as he went forward in the forest. 2)表示兩個同步發生的動作或行為,意思是隨著-----的發展.如: As time went on / by, she became more and more beautiful . As children get older, they become more and more interested in everything. 3)表示兩個短暫行為或事情幾乎同時發生.如:I watched her as she read the book. I thought of it just as you opened your mouth. Just as the flying worm hit her face, she gave a loud cry. 4)接在名詞后面表示某一個年齡段時.如: As a young man, he was active in sports. ②when作"當……的時候"解,可以指較短的(一點)時間,也可指一段時間。如:When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2hours. ③ while常表示一段較長的時間或一個過程,強調主句謂語動詞與從句謂語動詞同時發生。如:Work while you work. Play while you play. 2. As =Since 作"既然"、"由于"解,引導原因狀語從句,常用來表示已為人們所知或顯而易見的原因或理由。如: As he’s been ill for ages, I will help him. As / Since you're not feeling well, you may stay at home. As he wasn't ready , we went without him. 3. As =in the way that作"像"、"按照……的方式"解,引導方式狀語從句。如: Do as I told you. Remember, you must do everything as I do. 4. 用于as--- as或not / so/ as ---- as中,前一個as是副詞,后一個as是連詞,引導比較狀語從句。如:They helped the old as much as possible. I don't speak English so/ as well as she does. 5. 表示雖然,盡管 等,引導讓步狀語從句,常用倒裝語序,模式為: adj. /adv. / n.+as +主語+謂語+主句。如: Young as he is, he knows much. Tired as they were, they walked on. 6. 表示也------一樣。 She is a doctor, as was her husband. （二）、 as作關系代詞,引導定語從句,表示正如,這一點.如: He is very careful, as we all know. As is well-known, Taiwan belongs to China. 另外,當先行詞被the same, such等詞修飾時,常用as來引導定語從句。如: Such a clever girl as she can learn anything quickly. I was reading the same book as he bought yesterday. （三）、as作介詞的用法. 1.表示好像。如:He dressed as a policeman. 2. 表示作為當作。如：I found a job as a guide. 3. 當某人是某身份時。如：As a child , she was sent to abroad. 4. as引導的介詞短語大多用作狀語,as譯為"作為";少數情況可引起賓語補足語。如: As a Party member, I'll take the lead in everything. (狀語) She works as a model. (狀語) She has me as on （四）、作副詞的用法 1 表示與------等同。如：This dress is twice as expensive as that on |
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