1、his是是he的形容词性物主代词：是物主代词的一种（另一种为名词性物主代词），置于名词前，起修饰作用，表示某人的。
2、him是he宾格形式：宾格是人称代词，一般用在动词后面。
His mother always takes his part.
他母亲总是向着他。
No one doubted his ability, his industry or his integrity.
没有人怀疑他的能力、勤奋和正直。
His mother has been at his bedside throughout his illness.
在他生病期间，他母亲一直守候在他床边。
Go to him, tell him you're sorry.
去找他，告诉他你很抱歉。
She gave him a shake to wake him.
她摇摇他，把他叫醒。
We told him we'd back him whatever.
我们告诉他，在任何情况下我们都会支持他。
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