一. 连词：
1.定义：连接两个句子的单词或短语；
2.分类：并列连词，时间连词等；
3.连词与介词的区别：连词后连接句子；介词后接非句子。
二.并列连词：
1.分类：and, but, or;
2.用法：
(1)and ”和，而且”，前后状况一样或相似；用于肯定句；
e.g. Tom likes basketball and I also like basketball.
Tom is outgoing and hardworking.
=Tom is outgoing and he is also hardworking.
(2)but “但是”,表示转折，前后状况不一样或是相反；
e.g. Tom likes basketball, but I like baseball.
Tom is hardworking, but he is careless.
(3)or “或者”，表示选择关系；通常用于否定句和疑问句；
e.g. Tom doesn’t like apples or oranges.
Would you like to drink juice or water?
3.and和or 的特殊用法：
(1) and表示递进，“这样做的话，就会怎么样”，结构为“祈使句，and+句子（用将来时）”；
e.g. Work hard, and you will get good grades.
Stay here, and you will know the truth.
(2) or表示否则，“这样做的话，否则会或不会怎么样”，结构为“祈使句，or+句子（用将来时）。
e.g. Work hard, or you won’t get good grades.
Take the umbrella, or you will get wet.
(3)“祈使句，and/or +句子”的结构可以转换为相对应地条件状语从句。
e.g. Work hard, and you will get good grades.
= If you work hard, you will get good grades.
Take the umbrella, or you will get wet.
=You will get wet unless you take the umbrella.
或者=If you don’t take the umbrella, you will get wet.
三. 并列连词单项选择题习题专练及答案：
1.Think of an umber, _______ don't tell me what it is.
A.nor B.so C.or D.but
2. It is difficult to remember and write Chinese traditional characters (繁体字)，________ they are a great part of Chinese culture. We should keep them.
A. but B. and C. or D. until
3. When you get into trouble, will you keep trying ________ give up？
A. or B. and C. but D. so
4. —I want to be a teacher when I grow up.
—Work hard，________ your dream will come true.
A. or B. but C. though D. and
5. The flight was delayed by the storm，________ the passengers had to wait at the airport.
A. but B. or C. so D. for
6. Although it's raining, ________ they are still working in the fields.
A. / B. but C. and D. so
7. Tony is only four years old, ________ he draws very well.
A. but B. so C. or D. and
8. The little child has walked for a long time, ________ he can't go on walking.
A. but B. and C. or D. so
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