甲从网店购买一套沙发:How often 和how many times有什么区别吗？

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？

How often是“多久一次”是问频率的，
如：how often do you watch a football game?
你每隔多久看一场足球赛。

how many times 是“多少次”，仅仅问次数。
如：how many times have you been to Shanghai?
你去过上海几次？

how often是问间隔多久做一次某事(不问做事的时间多久).
how many times则问做多少次.
两者截然不同.

how often 用于一般现在时态或过去时态的句子之中.
如:He goes to buy something in a supermarket 3 times a week.转换成疑问句是:How often does he go to buy sth in a supermarket?
而how many times 常见于表示完成时态.
如He has been to the supermarket to buy sth for 3 times this week.这句话转换成疑问句就是How many times has he ......
简而言之,how often问的是事情一贯以来发生的频率,how many times问的是已经发生的事情的次数.

how often 问的是频率 多长时间一次
how many times 问次数