eal是形容词,形容词的语法功能是作定语或表语.really是副词,副词的语法功能是作状语.此句中it是主语,is是系动词,a good idea是表语（其中good是idea的定语）,really作状语.
it's really a good idea.为什么不是real,really不是副词吗
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