常用英语连词用法

However

1. however作副词用时，表示“然而；但是”，可以位于句首、句中和句末；

位于句首时，要用逗号与句子其它部分隔开；

位于句中时，其前后都要用逗号；

位于句末时,其前用逗号分开。例如:

She felt ill. She went to work, however, and tried to concentrate.

她病了。然而她照旧去上班，并且尽力集中精神工作。

His first response was to say no. Later, however, he changed his mind.

他最初的反应是不同意，可是后来他改变了主意。

2. however与but 两者都做“但是，然而”讲，而且都引出并列句。从语义上看，but所表示的是非常明显的对比，转折的意味较however要强。从语序上看，but总是位于所引出的分句之首，而however却可位于句首、句中和句末，同时从标点符号上看，but之后一般不得使用逗号，而however则必须用逗号与句子其它部分分开。

例如：

I thought those figures were correct. However, I have recently heard they were not.

我原以为那些数字正确无误，不过我最近听说并不正确。

3. however的其它用法：however可以作连词(conj.)，表示“无论以何种方式，不管怎样”，引导让步状语从句。例如：

You can travel however you like.你可以随心所欲地去旅行。

However I approached the problem, I couldn’t find a solution. 这一问题我不管怎样都无法解决。

As well as

as well as 是英语中常用的连接词，学生在使用时常常会出现错误，本文将其用法作以下简要归纳和说明。

1. as well as 可连接并列的单词或短语。例如：

It is unpleasant in summer as well as in winter. 夏天不好过，冬天也不好过。

The child is lively as well as healthy. 这孩子既健康又活泼。

2. as well as 连接两个谓语动词时，它们的时态应保持一致。例如：

He publishes as well as prints his own books.

他的书是他自己印刷出版的。

We are repairing the roof as well as painting the walls.

我们在粉刷墙壁同时也在修理屋顶。

*as well as 与动词连用时，其后可用V-ing形式，尤其as well as 位于句首时，此时相当于in addition to。例如：As well as breaking his leg, he hurt his arm.

他不但摔断了腿，而且还伤了胳膊。

She sings as well as playing the piano.

她不但会弹钢琴，而且会唱歌。

3. 如果as well as 前面是动词不定式，那么其后的动词也是不定式，但to要省略。例如：

You cannot expect her to do the housework as well as look after the children.

你不可能叫她既照顾孩子又做家务。

4. 由as well as 连接的复合主语并不影响谓语动词的数。例如：

Helen as well as I is eager to see the performance.

海伦和我一样急于要看演出。

I as well as they am ready to help you. 不仅他们愿意帮助你，我也愿意帮助你。

5. as well as 连接的人称代词既可以是主格也可以是宾格，但句意不同。例如：

They have invited you as well as me. 他们邀请了我，也邀请了你。（you和me都作invited的宾语）

They have invited you as well as I. 他们和我一样都邀请了你。（they和I都作invited的主语）

6. as well as 用于肯定结构和否定结构中，其意义不同。as well as 和not搭配使用，as well as 位于not前时，两者均否定；位于not后时，否定前者，肯定后者。例如：

George, as well as his brother, has gone abroad. 乔治和他兄弟一样都出国了。

George hasn”t gone abroad a s well as his brother. 乔治并没有和他兄弟一样出国去。（他兄弟一人出国）George, as well as his brother, hasn”t gone abroad. 乔治和他兄弟都没有出国。

7. as well as 在意义上通常强调前者，而not only …but also在意义上则强调后者。例如：

He”s got a car as well as a motorbike. 他不但有一辆摩托车，而且有一辆小汽车。

（= He”s got not only a motorbike but also a car. ）

8. 注意as well as 有时会引起歧义句。例如：

He can speak french as well as English.

（1）他会说英语，也会说法语。

（2）他说法语能说得像英语一样好。（…as well as he speaks English）

Neither ...nor

neither...nor...表示"既不……也不……"。

其含义是否定的，可连接任意两个并列的成份。例如：

She likes neither butter nor cheese.（连接名词）她既不喜欢黄油也不喜欢乳酪。

She is neither clever nor hardworking. （连接形容词）她既不聪明，又不勤奋。

此句中neither...nor...连接两个宾语。

当neither...nor...连接两个主语时，也应遵循"就近原则"。例如：

Neither he nor she is at home today. （连接代词）今天他和她都不在家。

若将neither...nor...句型变为肯定句，只需把neither...nor...改为both...and...即可，同时谓语动词必须用复数形式。

Either...or... neither...nor连接两个主语时，其谓语动词应与最近的一个主语在人称和数上保持一致，这就是我们通常说的"就近原则"。

both...and表示两者都……

例：Both you and I are good students.

你和我都是好学生。

注意：动词谓语用复数

either...or表示两者中有一个，要么…要么

例：Either you or I am good students.

要么你是好学生，要么我是好学生。

注意：动词谓语就近原则。

neither...nor表示两者都不

例：neither you nor I am good students.

你和我都不是好学生。注意：动词谓语就近原则。

Therefore