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whenever + clause (present simple) — 每当…的时候
表示习惯性事件。
Whenever I visit Beijing, I go to the Great Wall.
每当我去北京，我都会去长城。
每当；每逢
先理解核心含义，再看它在真实句子里的用法。
每当；每逢
at whatever time; every time that
Whenever I visit Beijing, I go to the Great Wall.
每当我去北京，我都会去长城。
用于引导时间状语从句。
在任何时候
At any time that.
在某个时候,无论何时
At the (single) time that, no matter when.
每次
Every time that.
不论何时
Regardless of the time that.
Whenever I hear that song, I remember my childhood.
每当我听到那首歌，我就会想起童年。
You can borrow my bike whenever you need it.
任何时候你需要自行车，都可以找我借。
You can call me whenever.
你随时都可以给我打电话。
表示习惯性事件。
Whenever I visit Beijing, I go to the Great Wall.
每当我去北京，我都会去长城。
表示任意时间。
You can call me whenever you need help.
你无论何时需要帮助都可以给我打电话。
Feel free to leave whenever you want.
你想什么时候离开都可以。
Not this
Whenever I were rich, I would travel the world.
Use this
If I were rich, I would travel the world.
每当（whenever）只能用于真实、重复的情况，不能用于非真实条件句；非真实条件应用 if + 虚拟语气。
Not this
Whenever you will arrive, let me know.
Use this
Whenever you arrive, let me know.
在每当（whenever）引导的时间状语从句中，即使表示将来也用一般现在时，不用 will。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
只要可能
I try to walk to work whenever possible.
只要可能，我都会走路去上班。
随便什么时候
You can come visit whenever you like.
你随便什么时候来拜访都可以。
必要时，每当需要时
The system updates automatically whenever necessary.
系统在必要时自动更新。
方便的时候
Please call me back whenever convenient.
请在方便的时候给我回电话。
一有机会就
She travels abroad whenever the opportunity arises.
她一有机会就出国旅游。
尽可能
She tries to help whenever possible.
她尽可能提供帮助。
随心所欲
He travels whenever the fancy takes him.
他随心所欲地去旅行。
有需要时
Contact me whenever the need arises.
有需要时随时联系我。
无论何时，无论何地，我们注定要在一起
Whenever I hear that song, I feel happy.
每当听到那首歌，我就感到快乐。
Use whenever naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
将'when'（当）和'ever'（永远）组合，记住'每当'=不论何时。
副词：用于疑问句或条件句，意为'无论何时'，常见于口语和写作；连词：引导时间状语从句，意为'每当'，通常用于描述习惯或重复事件。语体中性，适用于多种场合。
The words 'ever', 'wherever', 'whoever', 'forever', 'whatever', and 'whenever' all rhyme with the stressed vowel /ɛ/ and ending /vɚ/. 'However' has a different stressed vowel /aʊ/ and does not rhyme, though it shares the -ever spelling.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.