how often的用法和樣例：
例句
- How often do you go to church?
你隔多久去做一次禮拜? - How often (ie At what intervals) do the buses run?
公共汽車隔多長時間一班? - How often do you hear from your sister?
你多長時間接到你姐姐一次信? - How often do lions breed?
獅子多長時間產一次仔? - How often do you have a bad back?
你多長時間腰痛一次? - How often do you go swimming?
你多久去游泳一次? - How often do you go there?
你多長時間去一次那裡？ - How often do you eat out?
你隔多久在外面吃一次飯？
