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(错) They sat down and talk about something.

(错) They started to dance and sang.

(错) I saw two men sitting behind and whisper there. (对) They sat down and talked about something. (对) They started to dance and sing.

(对)I saw two men sitting behind and whispering there. 解析：

第一句： and 连接两个并列的谓语，所以 talk 应改为 talked。 第二句：and 连接两个并列的动词不定式，第二个不定式往往省略to，因此sang 应改为 sing。

第三句：and 连接感观动词saw 后面的用作的宾补的两个并列分词结构，因此whisper应改为whispering。

注意：and 还可以和祈使句或名词词组连用表示条件。（or也有此用法）

Make up your mind, and you'll get the chance.

= If you make up your mind, you'll get the chance. One more effort, and you'll succeed.

= If you make one more effort, you'll succeed. 2)both …and两者都

She plays (both) the piano and the guitar.

3)not only…but (also), as well as不但…而且

She plays not only the piano, but (also) the guitar.

注意： not only… but also 关联两个分句时，一个分句因有否定词not 而必须倒装

Not only does he like reading stories, but also he can even write some.

4)neither…nor 意思为\既不……也不……\与nor后的词保持一致。

Neither you nor he is to blame. 编辑本段表示选择的并列结构

1) or意思为\否则\。

I must work hard, or I'll fail in the exam. 我必须努力学习,否则我的考试成绩将要下降. 2) either…or意思为\或者……或者……\则。

Either you or I am right. 或者是你对,或者是我对.

编辑本段表示转折或对比

1) but表示转折，while表示对比。

Some people love cats, while others hate them. 典型例题

--- Would you like to come to dinner tonight? --- I'd like to, ___ I'm too busy. A. andB. soC. asD. but

答案D。but与前面形成转折，符合语意。而表并列的and， 结果的so，原因的as都不符合句意。

2) not…but… 意思为\不是……而是……\

not 和but 后面的用词要遵循一致原则。

They were not the bones of an animal, but (the bones) of a human being.

编辑本段表原因关系

1) for

判断改错：

(错) For he is ill, he is absent today. (对) He is absent today, for he is ill.

for是并列连词，不能置于含两个并列分句的句子的句首，只能将其放在两个分句中间。

2) so, therefore

He hurt his leg, so he couldn't play in the game. 编辑本段连词的误用

因为连词的种类非常多，有并列连词（连接并列句），有从属连词（引导复合句），而从属连词引导的从句又可分为三类：名词性从句、定语从句和状语从句。尤其应注意的是有些连词可引导不止一种从句，具有多重功能，这往往是学习的难点，也是易混点。 难点回顾：

1 as可引导多种从句，如时间状语从句、原因状语从句、让步状语从句、方式状语从句、比较状语从句以及定语从句。

［误］ Which you can see, he is always ready to help others. ［正］ As you can see, he is always ready to help others. ［析］as引导非限制性定语从句，当\正像\讲。 ［误］ Do like I told you.

［正］ Do as I told you.

［析］like是介词； as是连词，在这里作\按照\讲，引导方式状语从句。

［误］ He was reading then he was walking. ［正］ He was reading as he was walking.

［析］as强调两个动作同时进行，作\一边……一边……\ ［误］ As he is young, he knows a lot. ［正］ Young as he is, he knows a lot.

［析］as引导的让步状语从句应用倒装语序，应把表语提前。

2.that可引导多种从句，如定语从句、名词性从句、状语从句等。 ［误］ You don’t like him is none of my business.

［正］ That you don’t like him is none of my business. ［析］that引导主语从句，本身无实际意义，但不能省略。

［误］ The thief handed everything which he had stolen to the police.

［正］ The thief handed everything that he had stolen to the police. ［析］everything是不定代词，因此后面的定语从句只能由that引导。 ［误］ I am happy as you passed the exam. ［正］ I am happy that you passed the exam.

［析］that在形容词后面引导原因状语从句，不能用as。

3.where可引导多种从句，如定语从句、状语从句以及名词性从句。 ［误］ Go to find your watch. It’s there where you left it. ［正］ Go to find your watch. It’s where you left it. ［析］where引导表语从句，相当于at the place where。 ［误］ The place where there is water, there is life. ［正］ Where there is water, there is life.

［析］where引导地点状语从句，可以放在主句的前面，也可以放在主句的后面。

［误］ I can’t remember in which place I met him.

［正］ I can’t remember where I met him. ［析］where引导宾语从句，不能用in which。

4.what可引导感叹句、特殊疑问句、名词性从句等。 ［误］ How an interesting story he told us! ［正］ What an interesting story he told us!

［析］What an interesting story！=How interesting a story！ ［误］ I can’t remember the thing what he told me. ［正］ I can’t remember what he told me.

［析］what引导宾语从句，相当于the thing that。

5 no matter+what/who...与whatever/whoever...的区别：前者只能引导让步状语从句，而后者既可引导让步状语从句，也可引导名词性从句。 ［误］ I will make friends with no matter who shares my interest. ［正］ I will make friends with whoever shares my interest. ［析］引导名词性从句时只能用whoever。

［误］ You must hand in no matter what you’ve found. ［正］ You must hand in whatever you’ve found. ［析］ 引导名词性从句时只能用whatever。

6.whether和if的区别：两者引导名词性从句时都是从属连词，作\是否\讲，本身不作成分，此时句子中往往出现表示\不肯定\意义的一些短语，如not sure/certain, not known/decided,...is still question, depend on等。

whether 和if 引导动词后的宾语从句时可互换，但下列情况一般只能用whether:

(1) 引导介词后的宾语从句；（2）引导主语从句； （3） 引导表语从句；（4）引导同位语从句；（5）后面出现or not。

［误］ If you can pass the exam depends on how hard you work. ［正］ Whether you can pass the exam depends on how hard you work. ［析］引导主语从句只能用whether。

7.while, when, as 引导时间状语从句时的区别：

while只能表示\在一段时间或过程中\，即只能表示时间的\一段\，后面一般用进行时或表示状态的结构；when可以表示一段时间，也可表示时间的\一点\；as引导时间状语从句时，表示两个动作同时进行，作\一边……一边……\

［误］ I picked up some French words as I was having a holiday in Paris.

［正］ I picked up some French words while I was having a holiday in Paris.

［析］while强调在……过程中；as说明两个动作同时进行。 ［误］ We were having classes while someone knocked at the door. ［正］ We were having classes when someone knocked at the door. ［析］when可表示时间的\一点\，而while不能。

8.because, as, since(now that)引导原因状语从句时的区别： because引导原因状语从句时，表示直接的原因，可以回答why的提问；as只能是一种\附加的\理由，不能回答why的提问；since(now that)多表示双方都已很清楚的事实，作\既然\讲。