并列连词
1，表示递进或顺承关系：and并且
My girlfriend is very nice and I like her very much.
Work hard, and you will pass the exam.
2，表示选择关系：or或者；表否则：or, otherwise
Which do you prefer, tea or coffee?
Work hard, or you will fail the exam.
3， 表示转折关系：but但是；yet然而
I’d like to go with you, but I’m too busy．
Mrs. Miles is not rich enough, yet she has donated much to help the needy.
4，表示因果关系：so因此，for表示解释说明，因为
It must have rained last night, for the road is all wet.
The air here is polluted, so the crops are dying.
5，when做并列连词，意为“这时”
1)sb. was/were doing sth when...;
2)sb. was/were about to do/going to do sth when...;
We were having a meeting when someone broke in.
We were about to set off when it suddenly began to rain.
6，while作为并列连词，意为“而”，表示对比
I’d like to study law at university while my cousin prefers geography.
Some students like Michael Jackson, while others like Marie.
课堂练习
1, Mike put his hands behind his back, ____ nobody could see them.
A. so B. because C. or D. but 2, He is tall_______he has black hair.
A. and B. soC. or D. but
3, Many people like to travel by air, _____ Jim's family think that traveling by train is the best.
A. orB. and C. soD. but
4,You can watch TV this evening, ______ you must finish your homework first.
A. so B. orC. andD. but
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