how often

How often do you shampoo your hair?

你多久用洗发剂洗一次头?

How often we have been temerarious and rushed unwisely in.

有些人就是可以不顾一切为了自己破坏规矩。

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

不管怎样经常告诫, 是犯同样错误。