whenever

1. I mind my p's and q's whenever I see him.
   每当我见到他我都谨慎行事。
2. I'd like to see you whenever it's convenient.
   在你方便的时候我想来看看你。
3. Come whenever you like.
   你什么时候想来就来。

when.ev.er

adv.（副词）
At whatever time.
当…时候
Also when ever When.See Usage Note at whatever
也作 when ever 无论何时参见 whatever
conj.（连接词）
At whatever time that:
无论什么时候：当…时候：
例句：
We can leave whenever you`re ready.
你什么时候准备好我们就可以动身

Every time that:
每当：
例句：
The child smiles whenever the puppy appears.
每当那小狗一露面这孩子便面带笑容