英语语法之连词
一、定义：连接单词、短语、分句和句子的词。

二、分类：并列连词、转折连词、关系连词和因果连词。

三、用法：
1. and
① and 表示“和、且”在肯定句中连接并列的成分。

He is laughing and talking .
② adj / adv + and + adj /adv 表示“渐渐”。

Beijing is becoming more and more beautiful .
③否定句中and 变成or.
He doesn't want to eat any bananas or apples.
2.but 表示转折对比关系的连词，意为“但是”
He is poor ,but honest .
3.or
① or 有“或”的意思，表示一种选择
Would you like tea or water ?
② “祈使句……,or …” or 表示否则。

= If …not …, ……. .
Study hard , or you will fail(失败).
= _____ you _____study hard , you will fail .
③or 用在否定句中表示并列关系。

He can’t read or write .
4.both
①both “两者都”, 后面的名词、动词都用复数。

Both the answers are right .
②both of ….
Both of us are students .
③both …and…
Both you and she are right .
5.either/ either …or
①either “两者当中任何一个”,后有of 时接名词的复数形式，无of时接单数名词，动词用
单数形式。

You may wear either of the hats.
②either …or… “不是……就是……,或者……或者…….”动词与临近的主语保持一致。

即
“就近原则”.
Either you or he has to go = Either he or you have to go .
6.neither /neither …nor…
①neither “两者当中都不”,后有of 时接名词的复数形式，无of时接单数名词，动词用单数形式。

Neither of the answers ______(be) right .
② neither ….nor… “既不…….也不……”动词与临近的主语保持一致。

即“就近原则”.
Neither you nor I am right .= Neither I nor you are right .
四、不能同时出现在一个句子中的连词。

1).because ,so 不能同时出现在一个句子里，只用其中之一。

Because in our school we all knew him ,so we had no trouble in finding him. (F)
2).though /although ,but不能同时出现在一个句子里。

Though Australia is very large ,but the population is quite small. (F)。