How often do you exercise?

　　你多長(zhǎng)時(shí)間鍛煉一次？

　　How often do you go riding?

　　你多長(zhǎng)時(shí)間騎一次馬？

　　He was shocked at how often she used the F-word.

　　她常常使用粗俗的罵人話，這使他感到震驚。