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What + be + subject?
用于询问信息，be动词与主语一致。
What is your name?
你的名字是什么？
所……的事物；……的东西
先理解核心含义，再看它在真实句子里的用法。
所……的事物；……的东西
That which; the thing(s) that
What is your name?
你的名字是什么？
所...的事物；...的东西
That which; those that; the thing(s) that.
任何...的事物；一切...的东西
Anything that; all that; whatever.
I ate what you left in the fridge.
我吃掉了你留在冰箱里的东西。
What he said made everyone laugh.
他说的话让大家都笑了。
Please take what you need from the box.
请从盒子里拿走你需要的东西。
用于询问信息，be动词与主语一致。
What is your name?
你的名字是什么？
询问具体事物属性，名词置于what后。
What color is your car?
你的车是什么颜色？
关系代词用法，引导名词性从句。
I don't know what he said.
我不知道他说了什么。
Not this
The book what I read is interesting.
Use this
The book that I read is interesting.
在定语从句中，当先行词是特定名词时，不能用"what"作为关系代词，而应该用"that"或"which"。"what"只用于表示"所…的事物"，不用于修饰具体名词。
Not this
I don't know what is his name.
Use this
I don't know what his name is.
在嵌入式疑问句中，从句应使用陈述语序，即主语在动词前，而不是倒装语序。"what is his name"是直接疑问句的语序，在间接疑问句中应改为"what his name is"。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
重要的事情；要紧的事
What matters most is your health.
最要紧的是你的健康。
你需要的东西
Take what you need from the fridge.
从冰箱里拿你需要的东西吧。
我的意思；我所指的事情
That is not exactly what I mean.
那不完全是我想表达的意思。
成功所需的素质或条件
She has what it takes to become a leader.
她具备成为领导者所需的素质。
所见即所得
This editor is simple: what you see is what you get.
这个编辑器很简单：所见即所得。
未来会发生的事情；未来的前景
No one can predict what the future holds.
没有人能预料未来会发生什么。
由于；考虑到
What with the rain and the traffic, we were late.
由于下雨和堵车，我们迟到了。
等等；诸如此类的东西
You can use paper, cloth, or what have you.
你可以用纸、布或诸如此类的东西。
真实情况；事情的真相
Before you decide, let me tell you what's what.
在你决定之前，让我告诉你真实情况。
凡是过往，皆为序章。
What you believe can change your life.
你所相信的可以改变你的人生。
善恶到头终有报。
What you do now will come back to you later.
你现在做的事，日后会报应在你身上。
Use what naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
what 作代词时指“所……的事物”，如 what I said 就是“我所说的话”。联想 wh 开头词常表疑问，但这里它像手指指向已知事物，记住“what 指代事物本身”。
语域：neutral 常见场景：spoken English、written English 该词作为关系代词表示“所……的事物；……的东西”，属于中性语域。日常口语和书面语中都比较常见，没有明显正式或非正式之分。使用时通常无需特意调整语气，直接根据句子需要选用即可。
interrogative pronoun / relative pronoun
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.