often 
英 [ˈɒfən]  美 [ˈɔfən] 
adv. 时常，常常；往往，通常

例句：
It often rains here in the summer. 

这里夏天经常下雨。

I'd like to go skiing more often. 

我希望多去滑雪。

I shower twice as often as most people. 

我洗澡的次数比大多数人多一倍。

John came as often as he could. 

约翰尽可能常来。

How often do you go to the gym? 

你多长时间去一次健身房？

How often do you wash the car? 

你多久洗一次车？