用作連接代詞的what有三種典型用法：
1. 具有疑問性質，意為“什麼，什麼樣的”。如：
I don't know what he needs. 我不知道他需要什麼。(what在賓語從句中作賓語)
2. 具有感歎性質，意為“多麼”。如：
Only then did I recognize what silly mistakes I had made. 隻是在那時我才意識到我犯了多麼愚蠢的錯誤。(what在賓語從句中作定語)
3. 具有關系代詞性質的，意為“所…的”，此時相當于“the＋名詞＋that”或者all that，即好像是既包括了先行詞也包含了關系代詞，因此，有學者稱之為關系代詞型what。如：
What (=The thing that) happened after that was interesting. 後來發生的事挺有意思。(what在主語從句中作主語)
China is not what (=the China that) used to be. (what在表語從句中作表語)
The boy dived into water and after what (the time that) seemed to be a long time, he came up again. 他跳進水裡，過了好像很久之後，他才又從水裡出來。(what在賓語從句中作主語)
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