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    2017年6月大學(xué)英語六級(jí)語法：狀語從句
     
    1) 時(shí)間狀語從句
    時(shí)間狀語從句主要由以下連詞引導(dǎo)：when, whenever, as, while, since, until, till, before, after, as soon as, once, hardly (scarcely) …when, no sooner …than。
    I will discuss the matter with you when we meet tomorrow.
    時(shí)間狀語從句還可由某些可充當(dāng)連詞的名詞(the moment, the instant, every time,等)和副詞(instantly, directly等)引導(dǎo)：
    I will tell you the news the instant I know.
    Note:
    ①before除了可表示“在…之前”外，還可用來強(qiáng)調(diào)主句所表達(dá)的時(shí)間、距離很長(zhǎng)或花費(fèi)的力量相比較大，可譯為“…才”。(“not …before”可用來強(qiáng)調(diào)主句所表達(dá)的時(shí)間、距離很短或花費(fèi)的力量相比較小，可譯為“…就”)。
    It was a long time before I got to sleep again.
    ②如果位于when引導(dǎo)的分句之前的主句使用過去進(jìn)行時(shí)、過去完成時(shí)或“was/were about to, was/were on the point of”等結(jié)構(gòu)時(shí)，when表示突然發(fā)生某事，可譯為“正在…突然”或“剛…就”等。這時(shí)，不能夠用as或while來代替when。
    I was walking on the street when I ran into my old friend John.
    2) 條件狀語從句
    條件狀語從句主要由以下連詞引導(dǎo)：if, unless, providing/provided (that), suppose/supposing (that), on condition (that), as/so long as, in case等。
    So long as you work hard, you will surely achieve good results in examinations.
    3) 讓步狀語從句
    讓步狀語從句主要由以下連詞引導(dǎo)：though, although, even if, even though, whatever, however, whoever, wherever, no matter how/ what/ where/ when等。以下介紹幾種較特殊的讓步狀語從句。
    (1)while引導(dǎo)的讓步狀語從句多放在句首，while相當(dāng)于although，表示“盡管”，“雖然”。
    While I admit I did it, I didn’t intend to.
    (2)短語“even now/then/so”相當(dāng)于“though it is/was true”，表示“盡管如此”，“盡管這樣”。
    The fire was out, but even so, the smell of smoke was strong.
    (3) as引導(dǎo)的讓步狀語從句要倒裝。
    Child as he was, he could speak four languages.
    4) 比較狀語從句
    比較狀語從句主要由以下連詞引導(dǎo)：(not) as …as, (not) the same as, (not) such …as, not so …as, than, the + 比較級(jí)…, the +比較級(jí)…等。
    We have had a lot more rainfall this year than we had last year.
     
    

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