副词性连接词
副词性质的连接词不能象连词一样分句或主从复合句之间用逗号连接。也就是说它们不能连接两个分句或引导从句。它们引导的句子与前面的句子之间要用分号或句号，而它们与引导的句子之间往往用逗号。副词性质的连接词在写作中常常使用，主要分为以下几类：
1.表示顺序的，如first, in the first place, then, finally, in the end等等。尤其要注意then. 如：
误：He graduated from college in 2003, then he found a job.
正：He graduated from college in 2003, and then he found a job. / He graduated from college in 2003. Then he found a job.
2.表示递进关系的，如in addition, what is more, furthermore,moreover等。注意in addition 与in addition to 的区别：inaddition 是副词性质;而in addition to 是介词性质，后面必须接宾语。
3.表示转折关系的，如 however, nevertheless, none the less, on the contrary, in contrast, 等等。要注意不要把however 当成连词：
误：In 2003, the United States launched the war on Iraq on account of Iraq possessing weapons of mass destruction (WMD), however, no WMD has been found in Iraq so far.
正：In 2003, the United States launched the war on Iraq on account of Iraq possessing weapons of mass destruction(WMD). However, no WMD has been found inIraqso far.
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