含有宾语补足语的句子若变为被动语态，则宾语补足语便变成了主语补足语。

如以下两句中的 what you like, what he was 就是宾语补足语从句：
You can call him what you like. 你想叫他什么就叫他什么。
They made him what he was. 他们让他成了那个样子。

如以下两句中的 what you like, what he was 就是主语补足语从句：

He can be called what you like. 你想叫他什么就叫他什么。
He was made what he was. 是别人让他成了那个样子。