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避免使用不完整或冗长的句式 不完整的句式没有独立的从句;而冗长的句式则有两个以上的从句，而这若干从句之间并没有恰当地衔接。这两种错误都是我们应该努力避免的，具体做法如下。 不完整的句式 正式写作中的每句话都必须有独立从句。所谓独立从句，就是包含主语、谓语，并且不以下述连词作为句子开头： After if than whenever although in order that though where as provided that unless whether because since until while before so that 错误：Global warming. This is what the scientists and journalists are worried about. 正确：Global warming is the cause of concern for scientists and journalists. 注意，以并列连词and、but、or、nor和for作为单句的开头，则是可以接受的。例如： 正确：Most people would agree that indigent patients should receive wonderful health care. But every treatment has its price. 冗长的句式 在时间紧张的情况下，不少学生写出来的句子没有标点连接，或者只有逗号。例如： Current insurance practices are unfair they discriminate against the people who need insurance most. 我们有三种修改方法： 1)标注句号：Current insurance practices are unfair. They discriminate against the people who need insurance most. | 
