how often
how often常用于询问某动作在单位时间内所发生的次数，是对频度时间状语提问的词语。频度时间状语可以是often, usually, always, sometimes, never等副词，也可以是once a week, three times a month等副词短语。与how often相似的短语how many times（多少次），后面常跟限定的时间，如：how many times a week / a day / a month / a year, 并且要回答出次数。如：
—How many times a week does he play basketball?
—He plays basketball three times a week.
温馨提示：答案为网友推荐，仅供参考