therefore的用法(however和therefore区别)

两者用法如下：

1. however主要有两种用法：

1）however = no matter how,做连词,用于引导让步状语从句

如：He can't win the race however fast he runs.

无论/不管他跑得有多快,他都赢不了这次赛跑.

2）however做副词,表示转折,意思是“然而/但是”,用在句中时必须用标点符号和其他成分隔开.

如：He is clever. However, he is very lazy.

2. therefore只能做副词,意思是“因此/所以”,其所在的句子表示结果.

它和句子其他成分隔开不隔开都是可以的.

如：He worked day and night, and therefore he was able to buy the sports car.

= He worked day and night. Therefore, he was able to buy the sports car.

他日夜工作,所以有能力买那部跑车