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可尝试扩展句子。越复杂的句子,分析结果越丰富。
It is certain that he will hand over his business to his son when he gets old.
这是一个复杂句。
It is certain that he will hand over his business to his son
It形式主语
isbe 动词
certain表语(形容词)
that he will ··· son真实主语
when he gets old.he will hand over his business to his son
这是一个主语从句,其时态为一般将来时。
he主语
will hand over •••谓语动词短语(复合结构)
his business宾语
to his sonhe gets old.
这是一个状语从句,其时态为一般现在时。
he主语
gets {表语}系动词短语
old.表语(形容词)