是He often helps us还是He always helps us.

是He often helps us还是He always helps us.

　　两个都可以，只是语气不一样，前者使用often，表示经常，后者使用always，表示总是，语气较强，没有例外。

　　1、often

　　adv. 常常; 经常; 时常; 再三;

Early American weathervanes were most often cut from flat wooden boards. 

　　美国早期的风向标大多截自平直的木板。

Students often travel hundreds of miles to get here.  

　　学生常常赶数百英里的路来到这里。

　　2、always

　　adv. 总是，老是; 永远，始终; 常常; 不断地;

 No matter where you go in life or how old you get, there's always something new to learn about. After all, life is full of surprises.  

　　不管你生活在哪里，你有多少岁，总有新东西要学习，毕竟，生活总是充满惊喜。

The ideological divisions between the parties aren't always obvious.  

　　政党之间的意识形态界线并不总是泾渭分明的。