1. —How often do you play football?
—I usually play football after school.
2. —How often does Mary go to the concert?
—She often goes to it on Saturday evening.
3.—How often does my daughter take the medicine?
—Three times a day.
不知大家是否注意到，我们针对上面所说的频度副词和表示“在某段时间内某种动作的次数”的状语提问时，都要用how often。换句话说，如果要回答由how often提问的句子，我们通常要用频度副词或诸如every day, each week, once a week, twice a day, four times a month等来回答。例如：
4. —How often do you borrow books from the library?
—Twice a month.
5. —How often does your mother do the washing?
—She does it every day.
6. —How often can you go to the movie?
—Once a week.
在大家所做的练习中，常见的有“句型转换”。这种题型有一种“就划线部分提问”，要求针对陈述句中的划线部分提出问题（也就是把陈述句变成特殊疑问句），其中就有针对上面所说的频度副词或every day, each week, once a week, twice a day, four times a month等提问的句子。这时候自然要用how often来提问了。例如：
Jack watches TV three times a week. →How often does Jack watch TV?
Our school has a sports meeting twice a year. →How often does your school have a sports meeting?
要注意的是，陈述句在变成这种特殊疑问句时，其结构是：How often+助动词（或系动词 be）+主语+实义动词（如果前面是系动词be的某种形式，则不再用实义动词）+其它成分？
how long， how often， how soon三者都可以译成“多久”。how long用来提问“多长时间”，对“一段时间的长短”提问时用，与延续性动词连用；how often用来提问某动作或状态发生的频率，对“一段时间内发生了几次活动”（always，usually， often， never或twice a day等表示频度的词或短语）提问时用；how soon用来提问某人要“多快”能做好某事，或某事要“多快”能完成，对“过多少时间（就能……）”（in短语）提问时用，常用于将来时。而how far意思是“多远”，对距离提问时用。
eg:
How long did you stay there?
你在那儿呆多久？
How often do his parents let him watch TV?
他父母多久让他看一次电视？
How soon will her husband come?
她丈夫多久会回来？
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