as often as

1. 每当
   As often as he's tried to go there, he's always failed.

   每次他想去那里，总是去不成。

as often as not

1. 往往
   As often as not the buses are late on foggy days.

   每逢多雾天气，公共汽车往往误点。

every so often

1. 不时；偶尔
   We meet every so often.

   我们不时见面。

more often than not

1. 多半
   Every night, more often than not, you'd find my father at the local pub.

   每天晚上你大多能在附近的小酒店里找到我父亲。