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麻烦帮忙分析一下这个句子的结构~Why was the origin of life a sample step in

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麻烦帮忙分析一下这个句子的结构~Why was the origin of life a sample step in the Earth's history?
麻烦帮忙分析一下这个句子的结构~Why was the origin of life a sample step in
Why 疑问副词作状语
was 谓语
the origin of life主语
a sample step 表语
in the Earth's history 状语
把句子换成陈述句,成分会更加明了:
The origin of life was a sample step in the Earth's history
再问: 那麻烦问一下这个表语是个什么用法啊
再答: a sample step 是名词作表语 a sample step的核心词是step,a 和 sample都是定语修饰step