1.	How often do lions breed?
	狮子多长时间产一次仔？
2.	When you're ill, wanting to get well again is often half the battle.
	生病时,有决心把病治好往往是最为重要的。
3.	On hot days we often bathe/go bathing in the river.
	天热时我们常在河里[去河里]游泳。
4.	Water-pipes often burst in cold weather.
	水管在寒冷的天气里经常冻裂。
5.	The assembly of cars is often done by machines.
	汽车常由机器装配。

 

as often as not   往往，通常, 一贯
every so often   偶尔, 有时
more often than not   往往，通常, 一贯