Question

they have been good friends for many yeas句子成分

Answer 1

你好

they have been good friends for many yeas
他们是很多年的好朋友了。

主语：They
谓语：have been （现在完成时）
表语：good friends
状语：for many years

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Answer 2

they have been good friends for many years
他们多年以来一直是好朋友。

【they】主语【 have been】谓语【 good friends 】宾语【for many years】时间状语