what后面加什么从句
what可引导主语从句、宾语从句、表语从句、同位语从句。what 在从句中可作主语、宾语、表语等，不能省略。
例句
What he said at the meeting was very important．
他在会上所说的非常重要。
What surprised us is that he did it alone．
使我们吃惊的`是他一个人做了那项工作。
They stopped to see what was happening．
他们停下来看发生了什么事情。
The teacher got angry because of what the boy had done．
那个男孩子做的事情让老师很生气。