1>. Are you going with us or will you stay at home? 你同我们一起去，还是呆在家里呢?
2>. The students can go swimming or they can go mountain climbing.
学生们可以去游泳，也可以去爬山。
3>. You'd better go by taxi, or you will be late. 你最好乘出租车去，否则要迟到了。
4 for:表示“因为，表示因果关系”。是“前果后因”。
1>. He is late for class every day, for he gets up late every day.
2>. We passed the exam, for we studied very hard.
5. so: 因此，也表示因果关系，是“前因后果。”
1>. He gets up late every day, so he I slate for school every day.
2>. We studied very hard, so we passed the exam.
6. not only...but also意为“不但……而且”，表示同等关系。
1>. Not only can he drive a car, but he can also repair cars. 他不但会开车，而且还会修车。
2>. He was not only a good father, but he was also a good husband. 他不仅是个好父亲，也是个好丈夫。
7. either...or意为“不是……就是，或者……或者”，表示选择关系
1>. You can either do it by yourself or you can ask someone else to do it.
你或者自己做这件事，或者请别人做这件事。
2>. Either the teacher didn't explain the sentence clearly, or I didn't understand it.
不是老师没有把这个句子解释清楚，就是我没有理解。
