what后加什么形式
what后面是可以直接加名词，加形容词句型为What + (a / an) + 形容词 + 名词 + 主语 + 谓语。
What luck! 真幸运!
What a good boy he is!他是个多好的男孩！
what其他用法
1、what +主语+不及物动词/系动词+介词
例句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。
2、What+主语+及物动词
例句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。
例句It is none of your business what other people think about you. Believe yourself.
解析本句意为“别人怎么看你，与你无关，相信你自己。”其中It是形式主语，真正的主语是what other people think about you.