what用法归纳与总结，如下：
What+主语+及物动词：What he says is reasonable.解析：What he says是主语从句，what在主语从句中作宾语。
what+主语+不及物动词/系动词+介词：The judge does not consider what each eyewitness looks like.解析：what each eyewitness looks like是宾语从句，what在从句中作介词like的宾语。
What+主语+系动词：He is not what he was ten years ago.解析：本句意为“他不再是十年前的他了。”其中what he was是表语从句，what 在从句中作表语。
What后接名词，作定语：It is uncertain what side effect the medicine will bring about, although about two thousand patients have taken it.解析：what side effect the medicine will bring about是宾语从句，what 在从句中作side effect的定语。
What+及物动词+宾语或What+be done ： What makes the matter worse has been puzzling me.解析：其中What makes the matter worse是主语从句，what在从句中作主语。
what 用于固定搭配what do with (处理)： What do you do with this problem? 这个问题你怎样处理？
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