Question

how often,how many times,how much time的区别？

Answer 1

How often: 是对频率的提问
例如：how often does he purchase ?
他多久采购一次？
how many times :就是对次数进行提问：
如：how many times did he purchase in this year?
今年他采购了几次？

How many times就次数提问
how often 就频率提问
how often意为“多久……次、是否经常”，用来提问在某一特定的时间进行某个动作的次数，答语通常是always，usually，often，sometimes，once/twice a day/month等。

—How often do you get to school very early? 你多久早到校一次？
—Usually. 通常。

—How often do you see a film? 你多久看一次电影？
—Once a month. 每月一次。
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其他知识点
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。例如：

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？