1.and：
连接词 conj.
1）.和,及,与,同;又
They sang and danced all night.
他们通宵唱歌跳舞.
My mother and father have never agreed on this matter.
我父母在这件事情上从未意见一致过.
2）.然后
She went to the United States in 1960 and has lived there ever since.
她于一九六○年去了美国,此后就一直住在那里.
3）.而且
You must stop,and at once,this sort of behavior.
你必须停止此类行为,而且必须立即停止.
4）.就;所以,因此
Go straight on and you'll see a church.
一直走下去你便可以看到一座教堂.
5）.而,但是
Vegetable oil is digestible and mineral oil is not.
植物油易消化而矿物油则不行.
2.but
连接词 conj.
1.但是
I）t is hot in summer here,but it is not cold in winter.
这里夏天热,但冬天不冷.
2）.(通常用not...but...)而是
Our purpose is not to do it for you but to teach you to do it by yourself.
我们的目的不是替你做这事,而是教会你自己来做.
3）.可是,然而
She looks very young,but she is already in her 30's.
她看上去很年轻,可是她已三十多岁了.
4）.(表示惊讶、不同意等)喔,哇
Heavens,but it snows.
天哪,真的下雪了.
5）.(用来加强语句重复部分的语气)一定
We will be here on time.But on time.
我们将准时到达这里,一定准时.
6）.(用来引入新话题)那就
But now to the last question.
现在就来谈最后一个问题吧.
7）.(常用于否定句)而不;若不
But that I saw it,I wouldn't have believed it.
若不是亲眼目睹,我还不会相信呢.
It's not so high but we can jump it.
它并非高到我们跳不过去的地步.
8）.(用于含doubt,question等字的否定句中,相当于that)对于
There is no doubt but he won.
3.or
连接词 conj.
1）.或者;还是
Either you or I am to go.
你我之间总有一个人要去.
You may spend two or three days there.
你可以在那里呆上两三天.
2）.(用于否定句)也不
Mary never skis or skates.
玛丽从不滑雪,也不溜冰.
3）.否则,要不然
Hurry up,or you'll be late.
快点,否则你会迟到的.
4）.也就是说,换言之
She studies biochemistry,or the science of life.
她学生物化学,也就是生命科学.