关于how 的几个短语:
how often指每隔多久,主要用来对频度副词或状语。
(如:once a week, three times a month 等)提问。
how soon“多久以后”,常常用于将来时态;
how long“多久”,用于过去时、完成时或其他时态;
how many times“多少次”,用于过去时或完成时,对总计次数进行提问;
how much“多么,多少”,对程度进行提问,也可以对数量(不可数)或金钱进行提问。
如:How long have you been like this? (你这样已经多久了?)
How often does he wash his face? (他每隔多久洗一次脸?)