一、 ＂There be＂結(jié)構(gòu)
考生病句：
1. There are many people like to go to the movies.
2. There are different kinds of vegetables can be bought on the market by people.
正確表達(dá)：
1. There are many people who like to go to the movies.
2. There are different kinds of vegetables that people can buy on the market.
這兩個例句的錯誤比較有普遍性，因為在歷次考試中有不少考生不能正確運(yùn)用there be這一最常用的句式，怎樣寫好英語句子（二）。在這種結(jié)構(gòu)中，there是引導(dǎo)詞，沒有實際意義。be在句中作謂語，有時態(tài)和數(shù)的變化。
例如：
1. There was no school in the village at that time. (=there was not a school...)
注意：在否定句中，否定詞用no，也可用not a或not any。not a后接單數(shù)名詞，not a 后接復(fù)數(shù)名詞，no后面的名詞單復(fù)數(shù)都可以。
2. There is not a moment to be lost.
3. There are many people rushing into the cities every year.
4. There are many things we can do to prevent traffic accidents.
5. There is no use holding back the wheel of history.
從以上例句還可看出，句中的主語后面可接多種修飾語，如介詞短語、不定式短語、定語從句、分詞短語等等。這無疑使該結(jié)構(gòu)增加了表現(xiàn)力，使句子表達(dá)內(nèi)容更加豐富。 在運(yùn)用這一結(jié)構(gòu)時，考生最容易犯的錯誤是在there be之后又用了一個動詞作謂語，使句子結(jié)構(gòu)出現(xiàn)嚴(yán)重錯誤。這里列舉的考生的典型錯誤均屬這種情況，對此我們在寫作中要格外注意。
二、 比較結(jié)構(gòu)
考生病句：
1. Comparing with the bike, the car runs much faster.
2. The climate in Walton is colder than other cities.
正確表達(dá)：
1. Compared with the bike, the car runs much faster.
2. The climate in Walton is colder than that of other cities.
評議與分析：許多考生在作文中用compare或than表示比較，但相當(dāng)多的表達(dá)有誤。
在例1中，對兩個事物進(jìn)行比較的句式為Compared with A, B...,只能用compare的過去分詞，不能用現(xiàn)在分詞，因為B是分詞的邏輯主語，只能被比較。在例2中，考生誤將"天氣"與"城市"進(jìn)行比較，而二者沒有可比性，只有將后者改為"其他城市的天氣"才符合邏輯，很顯然，考生的錯誤是受了漢語表達(dá)習(xí)慣的影響。
比較結(jié)構(gòu)是常用結(jié)構(gòu)，正確地使用這一結(jié)構(gòu)可以使文章的句式增加變化，有利于提高寫作成績。一般說來，考生若能恰當(dāng)、正確地運(yùn)用這一結(jié)構(gòu)，其寫作成績應(yīng)在5分以上。
下面是比較結(jié)構(gòu)的一些常用的表達(dá)方法。
1． 同級比較
1） In 1998 we produced as many cars as we did in the previous five years.
2） We have accomplished as much in the past three years as would have taken ten years
in the past.
2． 比較級
1） Children now enjoy better medical treatment than before.
2） We can live longer without food than we can (live ) without water.
3． 最高級
1） This is the most interesting book I've ever read.
2） Of all his novels I like this one best.
4． the more…the more…結(jié)構(gòu)
1) The harder you work, the greater progress you will make.
2) The more a man knows, the more he discovers his ignorance.
5． 選擇比較
1) I prefer staying at home to going out.
2) They prefer to work rather than (to) sit idly.
3) He prefers to work alone.
注意：這里的1）句用的是Prefer A to B結(jié)構(gòu)，to為介詞，后接名詞或動名詞；2）句是以不定式作 prefer的賓語；3）句用法同2），只是不把rather than部分表達(dá)出來，其它英語寫作《怎樣寫好英語句子（二）》。
6． 對比
1) Motion is absolute while stagnation is relative.
2) He is tired out, whereas she is full of vigour.
注意：while 和whereas均可用于連接兩個意義對立的分句，相當(dāng)于漢語的"而"字。許多考生能較好地運(yùn)用這一句式，尤其在圖表作文中。
三、 表達(dá)原因的結(jié)構(gòu)
考生病句：
1. The real reason to our failure is not far to seek.
2. The reason for this is because some people want to earn plenty of money without
working hard.
正確表達(dá)：
1. The real reason for our failure is not far to seek.
2. The reason for this is that some people want to earn plenty of money without working
hard.
評議與分析：
以上兩個病句分別引自92年1月和97年12月四級考試的考生作文。從遣詞造句上看，這兩位考生具有一定的寫作能力，not far to seek, plenty of money以及without working hard等均運(yùn)用正確、恰當(dāng)。但令人遺憾的是，第一位考生不知道reason不與to搭配而應(yīng)接介詞for，第二位考生犯了一個中國學(xué)生常犯的錯誤，就是用because引起表語從句，because這個詞不能引起表語從句，在本句中只能改用that才正確。
掌握好表達(dá)原因的結(jié)構(gòu)是十分重要的，幾乎所有的寫作試題都要求寫原因或可以寫原因。在大學(xué)英語四、六級考試、研究生入學(xué)英語考試以及TOEFL考試中，寫作的文體基本上是議論文，而議論文的基本模式是擺事實、講道理，講道理就是說明原因。寫作測試的文體決定了表達(dá)原因結(jié)構(gòu)的重要性。
英語中用來表達(dá)原因這一概念的結(jié)構(gòu)有多種。我們可用as , because, since, seeing that, considering that, now that, not that...等詞組引出表示原因的從句。例如：
1. Now that we have seen these great achievements with our own eyes, we feel more
proud than ever of our country.
2. Professor Liu is strict with us because he wants us to make rapid progress.
3. Since we live near the sea, we enjoy a healthy climate.
4. Pollution is still a serious problem, not that we don't have the ability to solve it, but that
some people have not realized the consequences of the problem.
我們還可以借助某些詞語用簡單句表達(dá)原因結(jié)構(gòu)。例如：
1. The reason for this change is quite obvious.
2. Diligence is the key factor of success.
3. Idleness is the root of all evils.
4. He was ashamed to have made the mistake.(=He was ashamed that he had made the
mistake. =He was ashamed because he had made the mistake.)
除了上述的例句外，英語中還有很多或易或難的表達(dá)原因的結(jié)構(gòu)。我們在進(jìn)行寫作訓(xùn)練的時候，不能滿足于一知半解，要講究書面語言的正確性和準(zhǔn)確性。比如，because是最常用的'引導(dǎo)原因從句的連詞，語氣最強(qiáng)，表示直接的原因，若because置于句首，后面的主句不能再用so。用as引導(dǎo)的原因從句語氣較弱，所說明的原因是附帶的，而since表示的原因暗示著是稍加分析之后才能推斷出來的原因。
四、 否定結(jié)構(gòu)
考生病句
1. Some people think we needn't to worry about fresh water.
2. Nowadays many people don't like to go to the movies, too.
正確表達(dá)：
1. Some people think we needn't worry (或don't need to worry) about fresh water.
2. Nowadays many people don't like to go to the movies, either.
評議與分析：
例句1選自96年1月四級考生作文，例句2選自92年1月六級考生作文。例句1 的錯誤在于該考生混淆了need作為情態(tài)動詞和作為普通動詞的用法。need作為情態(tài)動詞時，主要用于否定句，后面的動詞不帶to, needn't worry，作we的謂語。need作為實意動詞時，可用于肯定句、否定句和疑問句，don't need to worry 中的to worry作don't need的賓語。例句2的錯誤在于該考生混淆了too和either的區(qū)別，這兩個詞都表示"也"的意思，但是在英語中too, also只能用于肯定句，而either只能用于否定句。
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