and, but or用法归纳.doc

and“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 youll 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 dont 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Ill be there in an hour or so.同步练习：1. Hurry up, _ youll be late for school. 2. Whos 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. Ill see you either on Monday _ on Tuesday.6. Put your coat on _ youll be cold.7. Im 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 cant 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!23. Come 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 didnt enjoy the picnic _ there was a sudden rain. (08连云港）A. if B. but C. because D. however( ) 2. Work hard, _ youll 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 didnt. _, he picked up his crying son and kissed him. (08淮安)A. Therefore B. Indeed C. Instead D. ButKeys：1. or 2. or 3. and 4. but 5. or 6. or 7. but 8. but 9. but