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表示转折关系：but 但是, while 而;
表示因果关系：for 因为, so 所以
Exercise 1：根据句意，用适当的连词填空。
1.He works quickly carefully.
2.Use your head, you'll find a way.
3.He never smokes drinks.
4.Would you like tea coffee?
5.Be careful, you'll break that vase.
6.I like to write to my friends, it takes too much time.
7.Li Ming is lazy his brother is hard working.
提示：1、一般情况下，否定句中的and要变为or。
2、while可表示转折，表示所连接的两部分形成对照关系。
and
and
or
or
or
but
while
Exercise 2：用括号里所给动词的适当形式填空。
1.He and I (be) the students in Class Three.
2.Both he and I (be) the students in Class Three.
3.Not only Bill but also his parents (want) to stay in China for another year.
4.He or his brothers (be) coming here this afternoon.
5.Either you or he (be) wrong.
6.Neither you nor I (be) going to watch TV tonight.
7.The teather as well as the students (be) reading in the library.
8.The students as well as the teather (be) reading in the library.
are
are