Whenever is a conjunction that means "at any or every time that".
Common usages include:
1. Whenever you're ready, we can start.
2. I'll be there whenever you need me.
3. Whenever it rains, the roof leaks.
In informal contexts, whenever can also express impatience or indifference:
"Oh, just come whenever..."
Whenever这词儿啊，说白了就是"任何时候"或者"每当"的意思。
常见用法给您列几个：
1. Whenever you're ready, we can start. （您啥时候准备好了咱就开整）
2. I'll be there whenever you need me. （需要我的时候随叫随到）
3. Whenever it rains, the roof leaks. （一下雨房顶准漏，没跑儿）
搁日常唠嗑里，whenever还能带点儿不耐烦的劲儿：
"Oh, just come whenever..." （爱啥时候来啥时候来吧...）
补充说明：这词儿跟"when"不一样，"when"就指具体某个时间点，whenever更随意，爱咋咋地的感觉您懂吧？