he是主格，用作主语，也就是一件事情的发出者，he后需加动词或系动词。
He is my brother but he doesn't like me.
他是我哥哥，但是他并不喜欢我。
It would be interesting to know what he really believed.
了解他的真实信仰会是很有意思的。
him是宾格，用作宾语，也就是一个动作的接受者，him放在动词后面。
I send a book to him.
我寄了一本书给他。
The project is still causing him a lot of problems.
这项工程现在仍然给他带来许多的麻烦。