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1、therefore有两种用法，一在整句中，一在分句中。

2、therefore是副词，但有时具有连词作用。

3、一、整句中时一般不放句末，句首后要有逗号，句中按一般副词使用2、做插入语(这两个分得清吧)eg.Therefore，we must learn English well. 2、They therefore can learn English well. 3、Many fast food restaurant ,therefore,have red furniture or walls.二、用在分句中，即一个句子一部分表示原因一部分表示结果。

4、这时一般词前要用分号，其后用不用逗号无所谓。

5、若第二个分句前是逗号或无符号，则要注意therefore是副词，和so不一样，要保持句子完整，应用and therefore。

6、eg.I had a headache;therefore I could not go to your party. 2、I was ill,and therefore could not come. 3、These birds are very beautiful and therefore liked by many people.。

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