逗号表示句子内部的一般性停顿。两个具有独立含义的句子,在没有连词的情况下简单地被一个逗号隔开是不正确的。改正这样的错误须用句号或分号代替逗号,或用并列连词(and, but, or, so, nor, yet)连接两个句子,或用从属连词(because,as, although等),否则会导致句子出现语法错误。

错例:Some people believe children in secondaryschool should study international news as a subject, others think that’sa waste of time.
正解:Some people believe children in secondaryschool should study international news as a subject. However, others think that’s a waste of time.
或:Some people believe children in secondaryschool should study international news as a subject, but others think that’s a waste of time.
改错练习:
1. Students should do some housework, it is goodfor them to be independent.
2. They are far away from parents and friends, theycan deal with everything by themselves.