英語四六級考試中閱讀翻譯、寫作、選詞填空，沒有不用語法的。大家如果在備戰(zhàn)這項考試的時候，一定要注意相關語法的運用。今天來看看英語四六級考試常見的語法考點，說不定對你的備考就有幫助呢!感興趣的朋友快跟上來吧!

一、定語從句?

引導定語從句的有關系代詞 as，who，whom，whom，which，that 和關系副詞when，where， why 等。

引導定語從句

(1)as 引導定語從句，相當于 which。如 I am from shanghai，as/which you know.

但 as 引導的定語從句可以放在句首，而 which 不能;

例：As you know，1am from shanghai。

(2)as 可作為關系代詞來引導定語從句，既可以單獨引導從句，又可以與主句中的 the same 或 such 相呼應，從句中的謂語動詞常省略。

2.關系代詞 that 與 which 用法區(qū)別：

(1)which 可以引導一個非限制性定語從句，that 則不能;

(2)which 之前可以有介詞，that 之前則不能;

(3)只能用 that，而不能用 which 的主要情形:

——當先行詞是 all，anything，few，litule，much，none、nothing，something 等不定代詞時：

——當先行詞被序數(shù)詞或形容詞最高級修飾時;

——當先行詞被 the very，the only 等詞修飾時。

例：Medical researchers are painfully aware that there are many problems to which they have not found solutions so far.

二.狀語從句?

1.讓步狀語從句

(1)由 no matter + wh-疑問詞【no matter what】和 wh-疑問詞+ever【whatever】。但 wh-疑問詞+ever 【whatever】引導的名詞從句則不能用 no matter替換。

Take the coat , no matter what coat it is / whatever coat it is.

(2) No matter whether...or...結構中可將 no matter 省略，形成 whether...or..或 whether...or not 引導選擇條件句。

例; The substance does not dissolve in water whether {it is}heated or not.

2.條件狀語從句

翻譯條件狀語從句時，要注意時態(tài)的選擇。

例;Please come here at ten tomorrow morning if it is convenient for you。條件狀語

從句，用if引導;主句是祈使句，相當于將來時態(tài)，故從句應用一般現(xiàn)在時。

3.時間狀語從句

例;We do not know it until a doctor discovered it by chance 。

4.原因狀語從句

常見引導原因狀語從句的引導詞有;because，as，now that/since， in that等。

三.名詞性從句

1.主語從句

漢語中的“的”字結構可譯成英語的主語從句，用 what 引導，相當于 the thing that.

例: What many people have not realized is that read books is a insteresting thing.

2.表語從句

In my seventies, one change I notice is that I am more easily to get tired than before.

四.比較結構

...as【與...一樣】，more..than 【比...更】，a bit/a little/a lot/even/far/gretly/many/much/sightly/still-+形容詞/副詞比較級這些結構。

注意：more than 表示“不只是，只不過”;no more... han...not..any more than..,表示‘與...一樣不...”。

例：I would prefer shopping online to shopping in a department store because it is

more convenient and time-saving.

例：Since my childhood I have found that nothing is more attractive to me than

reading.

2. The more...the more...“越...越...”

例：The more you explain ，the more confused me。

3.倍數(shù)表達法

——A is 倍數(shù)+the size/length/width of B 【A是B 的幾倍大/長/寬】

——A is 倍數(shù)+形容詞或副詞原級+as B 【A 是 B 的幾倍】

——A is 倍數(shù) more than B 【A 是 B的幾倍】

例：On average,it is said, visitors spend only half as much money in a day in Leeds

as in London.

4.表示與...相比較的短語 compare with 和 in comparison with

例：Your losses in trade this year are nothing compared with/in comparison with mine。

五.情態(tài)動詞

1.情態(tài)動詞中的 must，can，could，may，might都表示推測。其中 must 可能性最大，can 和 could 其次，may 和 might 最小。

2.情態(tài)動詞完成時所表達的意義：

——could have done 本可能做

——may/might have done 也許做了

———should have done 本應做

——must have done 肯定做過

六.倒裝結構

1.有否定含義的副詞或短語位于句首作狀語，這類詞有：neither，never, no, rarely, hardly...when, little，few， in no case ，no sooner...than等。

例:Not until he fanish his work did he realize he was seriously ill.

2.含有 only的狀語或賓語位于句首時，其句子的主謂要部分倒裝。

例：Not only did he charge me too much，but he completed his mission。

3.虛擬語氣的讓步狀語從句中，在省略了 If的情況下主謂部分倒裝。

Had I taken your advice 【ifI had taken your advice 】, all this misery might have

been avoided.

七.虛擬語氣

①would rather+that從句+一般過去時;

②It vital / necessary / important /urgent/ imperative /desirable /advisable /natural/ essential+that+(should)動詞原形;

③proposal/suggestion+that+動詞原形;

④it is time/about time/high time+that+一般過去時;

⑤lest+that+should+動詞原形;

⑥if only+that+would+動詞原形。

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