1、 串句
串句是不用连词或标点而把两个(或以上)独立的句子串在一起的错误表达。有些串句是不用任何标点间隔两个甚至更多的句子；有些串句是在该用句号时滥用逗号，忽略了逗号本身没有连接句子功能的原则。
No one can deny the fact that air pollution is an extremely serious problem the city authorities should take strong measures to deal with it。
There is a general discussion there days over education in many colleges and institutes, one of the questions under debate is whether education is a lifetime study。
修改和避免串句错误的常见方法：
①用句号把原句分成两个独立的句子；
②用连词连接两个句子；
③用分号连接两个句子。
如：
No one can deny the fact that air pollution is an extremely serious problem, so the city authorities should take strong measures to deal with it。
There is a general discussion there days over education in many colleges and institutes; one of the questions under debate is whether education is a lifetime study。
2、 破句
破句是把不完整的句子当作独立的句子来写时发生的错误。
以下是常见的几个破句的例子：
Students should be encouraged to take part-time job. Because it will benefit students and their family, even the society as a whole。
点评：从属连词引起的破句。常见的从属连词有after,unless, even if, even though ,since , before , when (whenever)，because, if, who(whoever)，while, as (as if )， which(whichever)， although , so that, where(wherever)， until, that等。像because这样的从属连词开头的从句是不能单独存在的，它依赖于另一个句子方能使意义完整，也就是说单独的从句本身就是破句。
修改后：Students should be encouraged to take part-time job because it will benefit students and their family, even the society as a whole。
A large number of people think that they had completed their education when they finished their schooling. Not realizing that a person’s education is a most important aspect of his life。
点评：分词引起的破句。当分词出现在一个短语或句子的开头时常常会产生破句，而这样的破句往往缺少主语或谓语动词的一部分。
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