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。
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