这是名词作状语,表示谓语动作发生时主语的身份。句子等于:
When he returned from the war, he was a broken man.
这类似于形容词作状语。形容词作状语,表示谓语动作发生时主语所处的状态。
He died young. = When he died, he was young.
He died a hero. = When he died, he was a hero.
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