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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 will have learned English for eight years by the time he graduates from the university next year
这是一个复杂句。
He will have learned English for eight years by the time he graduates from the university next year
He主语
will have learned •••谓语动词短语(复合结构)
English宾语
for eight years、by the time ··· yearhe graduates from the university next year
这是一个定语从句,其时态为一般现在时。
he主语
graduates谓语动词
from the university、next year