初中英語語法-as...as...結(jié)構(gòu)的學(xué)習(xí)要點(diǎn)

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    as...as...結(jié)構(gòu)的學(xué)習(xí)要點(diǎn)
    一、as…as 結(jié)構(gòu)的基本用法
    其基本意思為“與……一樣”,其中的第一個(gè)as副詞,其后通常接形容詞或副詞(用原級(jí)),第二個(gè)as可用作介詞(后接名詞或代詞)或連詞(后接從句)。使用時(shí)應(yīng)注意以下幾點(diǎn):
    1. 在否定句中,第一個(gè) as 也可換成 so:
    He doesn’t study as [so] hard as his brother. 他學(xué)習(xí)不如他弟弟努力。
    2. 在該結(jié)構(gòu)的兩個(gè)as之間通常接形容詞或副詞的原級(jí),但若涉及數(shù)量或程度,可用“as much+不可數(shù)名詞+as”和“as many+可數(shù)名詞復(fù)數(shù)+as”:
    You’ve made as many mistakes as I have. 你犯的錯(cuò)誤和我犯的一樣多。
    I haven’t got as much money as I thought. 我不像原來想像的有那么多錢。
    其間接形容詞時(shí),有時(shí)該形容詞還可修飾另一名詞,但這個(gè)名詞應(yīng)帶有不定冠詞(注意詞序):
    She is as good a cook as her mother. 她和她媽媽一樣是位好廚師。
    也可說:She is a cook as good as her mother.
    但不說:She is as a good cook as her mother. 或They are as good cooks as us.
    二、關(guān)于第二個(gè)as的詞性
    第二個(gè)as后接從句時(shí),該as通常為連詞,但有時(shí)這個(gè)as還充當(dāng)其后從句的主語或賓語,此時(shí)該as實(shí)為關(guān)系代詞。如:
    I gave him as much as he could eat. 他能吃多少,我就給了他多少。
    We’ve got food for as many people as want it. 我們的食物,無論多少人吃都?jí)蛄恕?BR>    注:若第二個(gè)as用作連詞引導(dǎo)一個(gè)表示將來意義的從句,則該從句可用現(xiàn)在時(shí)表示將來,也可直接使用將來時(shí)態(tài)。如:
    We’ll get there as soon as you do [will]. 你一到,我們就到。
    三、as…as…結(jié)構(gòu)的修飾語
    該結(jié)構(gòu)根據(jù)情況可用使用以下修飾語:(not) nearly, almost, just, nothing like, exactly, not quite, half, one-ten, twice, three times, 30 per cent等,并且這些修飾語必須置于第一個(gè)as之前,而不能置于其后。如:
    He doesn’t play half as well as his sister. 他演奏的水平不及他姐姐的一半。
    This dress is twice as expensive as that. 這件連衣裙比那件貴一倍。
    四、as…as…結(jié)構(gòu)的省略
    在非正式場合(尤其是美國英語中),有時(shí)可以省略第一個(gè)as。如:
    When over forty, he married a woman poor as himself. 他在40多歲時(shí)娶了一個(gè)像他本人一樣窮的女人。
    另外,若意思明確,有時(shí)可省略第二個(gè)as及其后的相關(guān)詞語。如:
    The pianos in that shop will be cheaper, but not as good. 那家商店的收音機(jī)會(huì)便宜些,但質(zhì)量沒那么好。