how often
【how often】意为“多久……次，是否经常”，主要用来对动作发生的频率进行提问，
即在某一特定的时间进行某个动作的次数。
如：
How often do you visit your grandma? 你多长时间去看你的奶奶？
How often do you go to see a film? 你多长时间看一次电影？
How often do you go to the park? 你多长时间去一次公园？
答语通常是always, usually, often, sometimes, once/twice a day / month / year等。
如： I visit my grandparents twice a year。
I go to see a film three times a month。
【练一练】
___do you visit your grandparents? I visit them twice a month。
A. How long
B. How many
C. How often
D. How soon
(沪江英语)
