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1. 表示累加，其意为“和”“又”“而且”。如：
Oil and water will not mix. 油和水没法混在一起。
Silk feels soft and smooth. 绸缎摸起来柔软光滑。
I grew excited, and a little frightened. 我变得很激动，也有点害怕。
2. 表示结果，意为“因此”，与so的用法比较接近。如：
He fell heavily and broke his arm. 他摔得很重，手臂都摔断了。
3. 表示条件，相当于if…then，含有“如果……那么……”的意味。如：
Do that again and I’ll call a policeman. 你再这样做我就要叫警察了。
Go at once, and you will catch up with them. 快去，那样你就会赶上他们。
4. 表示连续，既可表示一种连续不断的状态，也可以表示一个动作完成之后连续做另一个动作。如：
The train ran faster and faster. 火车开得越来越快。
He finished lunch and went shopping. 他吃完午饭而后去买东西。
5. 表示两个接挨着发生动作，意思是“然后，接着又”。如：
They kissed and said goodbye. 他们亲吻后就说了再见。
She read for an hour and went to bed. 她读了1小时的书，然后就去睡了。
6. 用于连接两个相同的词语，表连续性或程度的加深，意思是“一再地，重复地，继续增加地”。如：
cough and cough 咳个不停
It’s getting colder and colder. 天气愈来愈冷了。
7. 用在少数动词后表目的。如：
Come and have tea with me. 过来和我一起喝杯茶。
He stopped and bought some flowers. 他停下来买了些花。
8. 表示两个数相加。如：
5 and 5 makes 10. 5加5等于10。
9. 表示对比或转折，含有“尽管……还”的意味。如：
Tom’s 15 and still sucks his thumb. 汤姆15岁了，还嘬大拇指。
He aimed at the bird and missed it. 他瞄准那只鸟却没打中。
注意以下各句有无and的差别：
It being fine, we went out for a walk. = It was fine, and we went out for a walk. 天气很好，我们出去散步了。
In the classroom there are five people, the teacher included.=In the classroom there are five people, and the teacher is included. 教室里包括老师有5个人。
He bought a lot of books, most of which are about history. = He bought a lot of books, and most of them are about history. 他买了很多书，其中大多数是关于历史的。
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