how often does she visit her grandfather为什么要用howoften

问题描述:

how often does she visit her grandfather为什么要用howoften

how often 是对频率的提问词,相当于“多久一次”。
回答可以说: she visit her grandfather once a week .

意思是几次

how often 对频率提问,表示多久一次,所以用它.

表示频度,意思是“多久一次”