在英文写作时，标点符号该如何正确使用，许多人对此可能没有真正注意过。其实在进行学术论文写作时，遵循标点符号的使用准则也是非常重要的。举个简单的例子，如果用逗号分隔两个独立不相关的句子，这定会让读者感到困惑而影响表达力。若适当地使用分号来分隔，则可使文章更加通顺易懂。
因此，在进行英文写作的过程中，使用标点符号，如逗号comma (,), 冒号colon (:), 分号semicolon (;), 或破折号dash (—)时，有哪些准则需要被遵守呢？
本篇会介绍一下关于“逗号”的使用的方法。
英文写作中如何使用逗号(Comma)
在大部分的写作中，逗号是最常被使用的标点符号。但因为逗号的使用场景和使用要求最多，因此许多人会对如何正确使用感到困惑，以下是逗号的几点重要功能，以及适当的使用时机。温暖的火事物或短语时:
I bought bread, cheese, and pickles at the grocery store. (grocery store: 杂货店需要分隔两个独立的较长从句，并使用连接词连接时：
Astronomers have known about the positions of stars for centuries, but they didn't understand that the earth revolves around the sun.在介绍性短句的后面:
In preparation for the next convention,the representatives studied up on the most important issues.当需要区分附加说明部分的句子(parenthetical phrase)，或要分隔插入语(interrupter)时:
All doctors, if they care about their patients, are concerned with good office hygiene.
逗号的常见错误使用案例Comma splice. 不要在未使用连接词的情况下，使用逗号分隔两个独立的从句
错误范例: Thousands of protesters showed up on the streets,they were shouting and carrying large posters.
正确范例: Thousands of protesters showed up on the streets; they were shouting and carrying large posters.Combining lengthy phrases. 在复合句中使用逗号或用逗号来分隔短句会造成读者的困惑，这种情况应使用分号。
错误范例: Some useful subjects are English, which is an international language, math, which is used in all domains of sciences and social sciences, and philosophy, which underpins many other areas of study.
正确范例: Some useful subjects are English, which is an international language; math, which is used in all sciences and social sciences; and philosophy, which underpins many other areas of study.