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as可以作連詞、介詞及關(guān)系代詞和副詞?，F(xiàn)將其用法小結(jié)如下: （一）、 as作連詞的用法: 1.作“在-------期間，當(dāng)----的時(shí)候”引導(dǎo)時(shí)間狀語(yǔ)從句.注意與when、 while的用法區(qū)別。 ①下列情形時(shí),只用as, 而不用when或while。 1)用于表示同一個(gè)人的兩種動(dòng)作交替進(jìn)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(gè)同步發(fā)生的動(dòng)作或行為,意思是隨著-----的發(fā)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(gè)短暫行為或事情幾乎同時(shí)發(fā)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(gè)年齡段時(shí).如: As a young man, he was active in sports. ②when作"當(dāng)……的時(shí)候"解,可以指較短的(一點(diǎn))時(shí)間,也可指一段時(shí)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(zhǎng)的時(shí)間或一個(gè)過(guò)程,強(qiáng)調(diào)主句謂語(yǔ)動(dòng)詞與從句謂語(yǔ)動(dòng)詞同時(shí)發(fā)生。如:Work while you work. Play while you play. 2. As =Since 作"既然"、"由于"解,引導(dǎo)原因狀語(yǔ)從句,常用來(lái)表示已為人們所知或顯而易見(jiàn)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(dǎo)方式狀語(yǔ)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(gè)as是副詞,后一個(gè)as是連詞,引導(dǎo)比較狀語(yǔ)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(dǎo)讓步狀語(yǔ)從句,常用倒裝語(yǔ)序,模式為: adj. /adv. / n.+as +主語(yǔ)+謂語(yǔ)+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(guān)系代詞,引導(dǎo)定語(yǔ)從句,表示正如,這一點(diǎn).如: He is very careful, as we all know. As is well-known, Taiwan belongs to China. 另外,當(dāng)先行詞被the same, such等詞修飾時(shí),常用as來(lái)引導(dǎo)定語(yǔ)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(dāng)作。如：I found a job as a guide. 3. 當(dāng)某人是某身份時(shí)。如：As a child , she was sent to abroad. 4. as引導(dǎo)的介詞短語(yǔ)大多用作狀語(yǔ),as譯為"作為";少數(shù)情況可引起賓語(yǔ)補(bǔ)足語(yǔ)。如: As a Party member, I'll take the lead in everything. (狀語(yǔ)) She works as a model. (狀語(yǔ)) 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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