how often 多久一次，用来问频率，后跟一般疑问句。

如：How often do you go home?你多久回一次家？

扩展资料

例句：

How often do you exercise?

你多长时间锻炼一次？

How often do you brush your teeth?

你多久刷一次牙？

How often do you go to the theatre?

你多长时间看一次戏？