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可尝试扩展句子。越复杂的句子,分析结果越丰富。
I am so sorry that I won't be able to attend tomorrow's lecture on American history.
这是一个复杂句。
I am so sorry that I won't be able to attend tomorrow's lecture on American history.
I主语
ambe 动词
so sorry that ··· history.表语
I won't be able to attend tomorrow's lecture on American history.
这是一个宾语从句,其时态为一般将来时。
I主语
won't bebe 动词(复合结构)
able to attend ··· history.表语(形容词)