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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 was not immediately obvious that water was to be fundamental to the development of life.
这是一个复杂句。
It was not immediately obvious that water was to be fundamental to the development of life.
It形式主语
wasbe 动词
immediately obvious表语(形容词)
that water was ··· life.真实主语
notwater was to be fundamental to the development of life.
这是一个主语从句,其时态为一般过去时。
water主语
wasbe 动词
to be fundamental ··· life.表语(不定式)