标点符号对英文句意的表达有着十分重要的作用，让我们来看以下几个例句：
eats shootsand leaves VS eats, shoots and leaves
Let's eat, Grandma! VS Let's eat Grandma!
Woman,without her man, is nothing. VS Woman! Without her, man is nothing.
由以上例句可以看出，不同的标点符号有着不同的意义，同样的标点符号所处的位置不同，也能让句子的意思变得完全不同。
今天，我们先来看看逗号的使用规则：
逗号（commas）
1、用于分隔三个或三个以上的单词、短语或从句。
The entrée includes chips, salsa, and a beverage.
2、用于引导性从属从句后面。
Since we would be returning late anyway, we stayed to watch the sunset.
3、用于将句尾的引导性单词或短语提前。
In the light of day, everything looked different.
4、用于独立的句子之间，用for, and, nor, but, or, yet, so等进行连接。
My family went to see the live taping of Ru Paul’s Drag Race, but I stayed home with the flu.
5、用于分隔不重要的句子、从句或同位语（删除这部分内容不影响原句意思）。
My cousin, who recently joined the mafia, said it would be best if I skipped town for a while.
6、用于分隔成对的无特定排列顺序要求的形容词；在有特定排列顺序时，不应使用逗号。
They serve cheap, delicious meat.
They always have cheap taco meat.