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).祈使句+ and …… , “and” 表示“那么”之意。= If……
Study hard , and you will succeed .= If study hard , you will succeed .
2. but
表示转折关系的连词，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. = If you don't study hard , you will fail .
3).or 用在否定句中表示并列关系。
He can’t read or write .
4. both
1).both “两者都”, 后面的名词、动词都用复数。
Both the answers are right .
2).both of ….
Both of us are students .
3).both …and…
Both you and she are right .
5. either/ either …or
1).either “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.
2).either …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…
1).neither “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 is 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 .
