"I can come today," she said, "but not tomorrow."

逗号用于排列三个或以上的名词：

Green, blue, white and green are his favorite colors.

逗号用于非限制性定语从句：

Edison, who was the inventor of electric bulb, had over 2000 inventions.

写日期时，如次序是月－日－年，在日和年之间加逗号：

He was born on October 15,1983.

有些起连系作用的副词，如 however, therefore, hence, nevertheless, moreover

, thus, otherwise, besides等等：

China, however, is still at the primary stage of socialism.

3． Apostrophe ['] 表示所有:

This is David's computer.

Mary and Jim's father/Mary's and Jim's fathers

The football players' photo

4．破折号Dash [-]

在一个句子前作总结

Mild, dry, and clear - these are the characteristics of weather in Kunming.

在一个句子的前面或后面加入额外的注释

The kids－John, Bettie and Leo－were left behind while their parents went to church.

表示某人在说话过程中被打断

The woman said, "I want to ask - " when the earthquake

began to shake the room。

5．连字符Hyphen [-]

连接两个单词

well-educated, kind-hearted, good-looking

加前缀

anti-Japanese, non-stop, semi-conductor

在数字中使用

one-quarter， twenty-three, two-fifths