therefore的用法书上有个句子Manyfastfoodrestaurant,therefore,haveredfurnitureorwalls.这个句子中（主语,therefore,谓语宾语）请问这是therefore的其中一种用法么?还是本来就有这种句子表达方式...如

Question

therefore的用法
书上有个句子 Many fast food restaurant,therefore,have red furniture or walls.这个句子中 （主语,therefore,谓语 宾语）请问这是therefore 的其中一种用法么?还是本来就有这种句子表达方式...如果是,这种表达方式叫什么?therefore 既能当连词也能当副词么?

Answer 1

这个得分类讨论了,我试着解释清楚点.
therefore有两种用法,一在整句中,一在分句中.
一、整句中时一般不放句末,句首后要有逗号,句中1、按一般副词使用2、做插入语（这两个分得清吧）
eg.1、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.
这时一般词前要用分号,其后用不用逗号无所谓.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.
eg.1、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.
注：therefore是副词,但有时具有连词作用
算很明了了,祝学习层层高