How many times 是问次数，how often 是问频率

例句：How many times (well say goodbye)?

How many times (I made you cry)?

如果回答是类似于once a week这样，在一个时间段内进行多少次z的话，也就是对习惯进行提问，应该用How often提问。

如：-How often do you go swimming? -I swim once a week.

如果回答是类似于I've been there once这样，也就是对“做过多少次”提问的话，应该用How many times提问。

如：-How many times have you been to England? -I've been there once.

简单的区分方法就是，如果答句是一般现在时，问句用How often，如果答句是完成时，问句用How many times。