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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 until twelve o'clock that I went to bed last night.
这是一个复杂句。
It was not until twelve o'clock that I went to bed last night.
It强调句主语
wasbe 动词
until twelve o'clock表语(介宾短语)(被强调成分)(原从句中的状语)
that I went ··· night.从句(抽离强调成分)
notI went to bed last night.
这是一个从句,其时态为一般过去时。
I主语
went to •••谓语动词短语
bed宾语
last night.