Either you go or he comes. 不是你去就是他来。
The students were reading when the teacher came into the classroom. 当老师进教室时，学生们正在读书。

5、时间副词和地点副词在一个句中, 地点副词在前面时间副词在后面。
We went shopping in the supermarket at 9 o'clock yesterday.
昨天九点钟我们到超市买东西了.
What were you doing in the classroom yesterday afternoon?
昨天下午你在教室里干什么？
The accident took place in the Eleven Avenue one hour ago.
一小时前十一号大街发生了一场事故。

6、否定副词在句首，句子要倒装，如：
Never have I felt so excited!

兼有两种形式的副词：
1) close与closely
close意思是"近"； closely 意思是"仔细地"
He is sitting close to me.
Watch him closely.

2) late 与lately
late意思是"晚"； lately 意思是"最近"
You have come too late.
What have you been doing lately?

3) deep与deeply
deep意思是"深"，表示空间深度；deeply时常表示感情上的深度，"深深地"
He pushed the stick deep into the mud.
Even father was deeply moved by the film.

4) high与highly
high表示空间高度；highly表示程度，相当于much
The plane was flying high.
I think highly of your opinion.

5) wide与widely
wide表示空间宽度；widely意思是"广泛地"，"在许多地方"
He opened the door wide.
English is widely used in the world.

6) free与freely
free的意思是"免费"；freely 的意思是"无限制地"
You can eat free in my restaurant whenever you like.
You may speak freely; say what you like.
副词有加a或ly的 区别在于通常加a 的副词描述一种状态，而加ly 的副词则倾向于感觉。