e.g. Work hard and you will live happily. = If you work hard, you will live happily.
Come early and you will see him. = If you come early, you will see him.
She couldn't find her mother and began to cry. 她找不到妈妈，于是哭了起来
It's a fine day today, and everyone is busy. 今天是个好天气，因而人人都很忙
表示递进或转折
and表示转折时，相当于but，但语气较弱，可译为“而且”、“可是”、“不过” 或不译
e.g.
I mean you eat too much, and you don't take enough exercise. 我的意思是你吃的太多，而且运动得不够。
They call me Lily sometimes, and I don't always tell them that they've made a mistake. 他们有时叫我莉莉，但我并不总是告诉他们说他们弄错了。
时间状语（相当于时间状语when的作用，强调and后者内容）
e.g. He was just going out and the telephone rang.
She was walking down the road and heard someone singing
e.g. Then he got out of the lift and climbed up to the fifteenth floor on foot. 于是他从电梯里走 出来，然后步行爬上第15层楼。
Go along the street, and take the third turning on the right. 沿这条街走，然后在第三个路口向右拐。
e.g. They talked and laughed happily. 他们愉快地边谈边笑。
The baby watched and listened. 这个婴儿边看边听
表示意义上的增补
and连接两个分句，第二个分句是第一个分句的补充或进一步说明，可译为“又 ”、“同时”等
e.g. If you want to be thinner and healthier, you have to eat less food and you also have to take more exercise. 如果你想既苗条又健康，你就得少吃食物——同时，你还得多进行运动。
Don't be late - Oh, and put on your old clothes. 别迟到——噢，还要穿上你的旧衣服
表示强调，加强语气
用and连接两个相同的动词表示动作的反复；
e.g. The baby laughed and laughed. 这个婴儿笑呀，笑个不停
用and连接两个相同的副词，表示动作的延续；
e.g. They talked on and on very happily. 他们很高兴地谈了又谈
用and连接同一个形容词或副词的比较级表示程度的逐步加深
e.g She looked at me and cried harder and harder. 她看着我，哭得越来越厉害
and有时连接两个反义词
and连接的两个反义词在句中作状语或后置定语，这两个词的次序不得颠倒
e.g. He uses a lift to go up and down. 他乘电梯上楼下楼。
When Christ was born nearly two thousand years ago. many people, rich and poor, gave him presents. 差不多两千年前，耶稣出生时，许多人，无论贫富，都给他礼物。
and 连接两个数词或连接百位和十位之间的数词
What's one and two? 一加二是多少？（and 翻译为”加“）
There are three hundred and sixty-five days in a year. 一年有365天（and 不翻译）
and用于固定词组或结构中
Both John and Ann have got penfriends. 约翰和安都有笔友。
The museum is between the post office and the hospital. 博物馆位于邮局和医院之间。
I love autumn because it's nice and cool. 我喜爱秋天，因为它很凉爽
