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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'm very glad to have received the letter you sent me two weeks ago.
这是一个复杂句。
I'm very glad to have received the letter you sent me two weeks ago.
I主语
'mbe 动词
very glad to ··· ago.表语
you sent me two weeks ago.
这是一个定语从句,其时态为一般过去时。