文档介绍：英语学习：常用错的5个标点符号
1. Possessive apostrophes
名词全部格符号
名词全部格符号是很难，它以几种不同的方式放在单词后边。那么，我们究竟该怎样去使用它e into separate sentences, as in these two examples:
很明显，当两个从句彼此平衡联系严密不能够被分成两个独立的句子的时候，你就应当使用分号了。就像这两个例子：
The road runs through a beautiful wooded valley; the railway line follows it.
这条路穿过一条树木繁茂的山谷；铁路线紧随这条山谷。
Erik did not give me your keys; he gave me mine.
艾瑞克不给我你的钥匙；他把我的钥匙给我了。
You can also use a semicolon to mark a stronger division in a sentence that already has commas: The study showed the following: 76% of surveyed firms monitor employee Web-surfing activities, with 65% blocking access to unauthorized Internet locations; over one-third of the firms monitor employee computer keystrokes; half reported storing and reviewing employee emails; 57% monitor employee telephone conduct, including the inappropriate use of voicemail.
你可以使用分号在一个有逗号的句子里表示一个更加剧烈的停顿：调查显示如下：76%受调查的公司监视员工上网活动，65%会阻碍不合法的网址；超过三分之一的公司对员工进展键盘监听；据报告一半的公司还会存储并检查员工的email；57%的公司会对员工进展电话监听，包括对语音信箱的不合理使用。
3. Colons
冒号
The best way to differentiate the colon from the semicolon is that where the semicolon provides a strong division in a sentence, the colon provides a sense of forward motion.
区分冒号和分号的该方式就是看他们的位置，分号在句中供应一个剧烈的停顿，冒号在句中供应一种进一步的解释。
There are three mai