how often

How often do you shampoo your hair?

你用洗发剂洗一次头?

How often we have been temerarious and rushed unwisely in.

有些人就是可以不顾一切的为了自己的利益破坏规矩。

Regardless of how often I correct him, he always makes the same mistake.

不管怎样经常告诫他, 他总是犯同样的错误。