英语中常见的标点符号有逗号(,) 分号(;)冒号(:)破折号(-)句号(.)标点符号的使用是让句子的意思表达更加清楚。标点可以有助于句子的修饰成分分析，量词也会被分为修饰可数名词和不可数名词之分。今天我们就来讲一下GMAT语法标点的考察。
1.句号：放在句末。表示一句话结束。I am hungry.
2.逗号：逗号放在句中，表示一个短促的停顿，它主要用来把下面的这些成分和句子的其他成分隔开：同位语Shelley,my sister,looks beautiful.放在句首的状语She walked slowly, stopping frequently to rest.非限制性定语从句Peter，whom you met in London, is now back in Beijing.平行The main products of the district are wool, cotton and timber.
不要用逗号连接两个句子。
当句子中两个谓语动词发起者是同一个人时，不要在and 前面加上逗号。
◆ Wrong: Earl walked to school, AND later ate his lunch.
◆ Right: Earl walked to school AND later ate his lunch.
◆ Right: Earl walked to school, AND HE later ate his lunch.
3.分号：表示的停顿比句号短，比逗号长，主要用来连接2个独立的分句It was getting late; she must start back for the village.
分号(;)连接两个相关的语句，每个部分都可以独自站立作为一个句子，但是如果句意上前后两者是有从属关系的则不能用分号：
◆ Right: The dam has created dead zones, WHERE fish have disappeared.
◆ Wrong: The dam has created dead zones; fish have disappeared.
分号又常常同些连接副词一起使用，如however, therefore, or in addition ，注意这些词和连词and 等又完全不相同，所以对于这些词，常常使用分号进行连接：
◆ Wrong: Andrew and Lisa are inseparable, THEREFORE, we never see themb apart.
◆ Right: Andrew and Lisa are inseparable; THEREFORE, we never see them apart.
而另一种比较少用的分号使用方法是将同一类的东西分开，而这些东西之间是用逗号分隔的：
◆ Wrong: I listen to Earth, Wind & Fire, Wow, Owls, and Blood, Sweat & Tears.
◆ Right: I listen to Earth, Wind & Fire; Wow, Owls; and Blood, Sweat & Tears.
4.冒号：主要用来例举东西There are in English two articles: the definite article and the indefinite article.
冒号(:)为之前的事提供进一步的解释，说明。冒号前的通常是一个句子，可以独立存在，而冒号后则无需是句子，而有时会在冒号后加入namely 或that is。
I love listening to many kinds of music:
namely, classical, rock, rap, and pop.
要说明的部分离冒号越近越好：
◆ Worse: Three factors affect the rate of a reaction: concentration, surface area, and temperature.
◆ Better: The rate of a reaction is affected by three factors: concentration, surface area, and temperature.
5.破折号：单项破折号主要用在一个解释性句子的前面He has two sisters-----a doctor and a teacher.双向破折号是插入语的成分，也是解释说明Two of the strongest animals in the jungle—the elephant and gorilla—are vegetarians.
破折号( - )是一个灵活的标点符号，GMAT考试中偶尔会用到。有时破折号可以代替逗号来使用：
By January 2, 2000, the so-called “Y2K problem” was already widely considered a joke—although the reason for the non-event was the huge corporate and governmental investment in prior countermeasures.
但有时候破折号又是必须的：
My three best friends—Danny, Jimmy, and Joey—and I went skiing.
这句话如果用逗号就会让人误以为有七个人go skiing 。破折号有时用来解释或重复之前句子的某个部分，但不像冒号需要紧跟着需要解释的词前面：
Post-MBA compensation for investment bankers tends to surge far ahead of that for management consultants—by tens, if not hundreds, of thousands of dollars a year.
上面的这个例子中by tens, if not hundreds, of thousands of
dollars a year 解释句子前面的far。
》》点击了解GMAT句子改错之连词，标点和量词考点解析
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