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可尝试扩展句子。越复杂的句子,分析结果越丰富。
He was generous with his time, for which I was grateful.
这是一个复杂句。
He was generous with his time, for which I was grateful.
He主语
wasbe 动词
generous with his time,表语(形容词)
for which I ··· grateful.for which I was grateful.
这是一个关系从句,其时态为一般过去时。
I主语
wasbe 动词
grateful.表语(形容词)