原标题：冒号的用法

冒号有下面用法：

1. 用在一个严肃的长引语前(在一般短的引语前用逗号):

Bacon said : “Reading makes a full man, ..."

2. 用在正式信函的称呼语后(在非正式信函中用逗号):

Dear Sir :

*** 3. 用在总称之后, 后面跟有例子:

He has many books:Hamlet,Paradise Lost,Don Quixote,and others.

Correct the following words: childs,mouses,oxes.

Our question: Why(or why)should man kill himself?

My opinion is this: Nobody thinks himself a bad man.

新SAT语法例句：

In 1791 President Washington issued a directive: the capital would be situated on the Potomac River and encompass a ten-mile square that included the booming ports of Georgetown, then a part of Maryland, and Alexandria, Virginia.

Renewable energy sources pose a challengefor the business and utilities that use them : the need to store surplus energy to use later, during times of peak demand.

Currently, only two power plantsuse CAES : one in MaIntosh, Alabama, and another in Huntorf, Germany.

To provide examples of proper word use for his Dictionary, Johnson looked to thosehe considered the foremost experts on the English language : the leading English writers of the past and present.

4.用在举例后,后面跟总称:

The sea,the sky,the ship : (或-)these are all I see.

To work,to sleep,and to play :(或-)all these are essential things in life.

5.用在表示著作、时间等的词语内,把较大和较小单位分开:

Macbeth IV:1:12

Matthew V:5

6:35 a.m.

6.用在比例中:

1:3:8 (=the ratio of one to three to eight)

7.用在标题和副标题之间:

Yiching: the Philosophy of Change

注：

本文参考了《英语语法大全》（张道真 编著）。

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