I bought him a book as a birthday gift.

我给他买了一本书作为生日礼物。

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I was bought a book (by him).

他给我买了一本书。

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I bought this book for my son and he is excelling in his class. He is a step ahead the rest of the kids in his class and his teacher asked what we are doing to help him.

我给我的儿子用了这本书之后，他现在在班里的表现非常优秀，比班上其他的孩子超前了一大步，他的老师问我们是怎么帮助他学习的。

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