◇“和”，连接两个名词，代词或两个形容词等语法作用相同的词语。

但否定句中用or。

但如果前后名词都用no修饰，则可以用and。

The air was so warm and bright.
It has no feet or legs.
It has no eyes and no ears.
I have no sister or brother.
◇“然后”。

用于连接两句有时间上先后的句子。

She washed the dishes and dried them.
◇表示目的，意图。

用于go, come, stop, run, stay等动词后。

Come and have a drink.
Go and buy one.
◇“只要……就会……”“如果……那么……”，用于祈使句后，表示条件与结果的关系。

Knock on the door, and it will be opened.
Come late again, and you’ll be fired.
but
◇但是，可是，而，却。

He is in poor health, but he still kept working.
◇用在表示歉意的话后，引起一个分句，这个but通常不译成汉语。

Excuse me, but can you tell me how to get to the railway station?
◇不与although/though (“虽然，尽管”)连用。

Though he is old, he works hard.
He is old, but he works hard.
◇作介词，表示“除了……之外”。

She did nothing but watch TV.
or
◇“一般疑问句+ or+被选择的部分”构成选择疑问句。

Do you like apples or pears?
Would you like tea or coffee?
◇“祈使句+or +陈述句”，表示“……，否则，……”
Hurry up, or you will be late.
Work hard, or you cannot pass this exam.
◇“和”，否定句中代替and。

I don’t like bananas or pears.
◇or 连接并列主语时，谓语动词的人称要与最后的那个主语保持一致。

Either you or he is right. 要么你要么他是对的。

◇or so 大约，左右
I’ll be there in an hour or so.
同步练习：
1.Hurry up, _________ you’ll be late for school.
2.Who’s the youngest, Rose, Helen ________ Betty?
3.Work hard, ______ you will succeed.
4.Excuse me, _______ could you tell me the way to the post office?
5.I’ll see you either on Monday _______ on Tuesday.
6.Put your coat on ______ you’ll be cold.
7.I’m sorry, _______ could you repeat that, please?
8.There is no one here ______me.
9.She can do anything _______sing.
10.The sky is blue ________ everything is beautiful.
11.We were very tired _______ we were very happy.
12.He never smokes ________ drinks.
13.There is no air ______ water on the moon.
14.Your classroom is clean _______ tidy.
15.My house is small _______ lovely.
16.Lucy worked hard at English ______ she came first in the English exam.
17.It is hot today, ______ some boys are still playing basketball outside.
18.People can’t live without air _____ water.
19.The Summer Palace is large _______ beautiful.
20.He looks tall and strong ______ he is afraid to go out at night.
21.We had no water ______ food at that time.
22.Hurry up! ______ we will be late!
e on! _______ you will win the match.
24.Be careful! _______ you will hurt yourself!
25.He usually goes to school by bus ______ by bike.
江苏13城市中考试题汇编：
( ) 1. We didn't enjoy the picnic _______ there was a sudden rain. (08连云港）
A.if
B. but
C. because
D. however
( ) 2. Work hard, _____ you'll pass the English exam this time. (08扬州）
A.or
B. but
C. because
D. and
( ) 3. He was sure his Dad would beat him, but his father didn't. ______, he picked up his crying son and kissed him. (08淮安)
A.Therefore
B. Indeed
C. Instead
D. But
Keys：
1. or
2. or
3. and
4. but
5. or
6. or
7. but
8. but
9. but 10. and
11. but 12. or 13. or 14. and 15. but 16. and 17. but 18. or 19. and 20. but 21. or 22. Or 23. And 24. Or 25. or
1. C
2. D
3. C。