表示
并列
关系
and
连接两个词或短语，多用于肯定句中
Go and fetch something to eat.
He started to shout and sing.
Read it slowly and clearly.
The balloon flew higher and higher.
You can meet teachers and students.
Proper diet and exercise are important to health.
连接两个句子，表示因果、对比、条件、假设、目的等
They didn't catch the bus, and had to stay in a hotel for the night.
Mary likes music and Lily is fond of sports.
Work hard and you will succeed.
One more week and we'll accomplish the task.
both...and
连接主语、宾语、表语、状语、谓语等成分， 连接并列主语时谓语动词用复数形式
Both teaching and research work are making great strides.
The delegates visited both New York and Boston.
Both she and the headmaster were pleased with the boy.
The situation both at home and abroad is in our favor.
not only...but (also)
连接两个词或短语，连接主语时谓语动词采取就近原则
Not only the students but (also) their teacher is enjoying the movie.
He can speak not only French but (also) English.
He not only had seen the film but (also) remembered what he had seen.
连接两个句子，not only位于句首时，not only后的句子要部分倒装
Not only is he a scientist, but he is also a fighter.
Not only was everything he had taken away, but (also) his citizenship.
as well as
连接两个词或短语，作主语时，谓语动词与前一个主语保持一致
The teacher as well as the students enjoys listening to English songs.
He grows flowers as well as vegetables.
We are repairing the roof, as well as painting the walls.
It is important for you as well as for me.
when
表示“就在那时”，一般用于固定句型
I was about to leave when the telephone rang.
转折
的并
列连
词
but
转折语气最强
Learning the guitar isn't difficult, but you have to practice.
The changes in the city will cost quite a lot, but they will save us money in the long run.
Excuse me for breaking in, but I have some news for you.
while
强调“对比”
You like sports, while I'd rather read.
They were surprised that a child should work out the problem, while they themselves couldn't.
yet
常用于否定句
He was in deep trouble, yet he didn't lose heart.
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