having done 用于句首有哪些情况

Question

如题所述

Answer 1

有三种，完成时态，表主动，还有就是时间上先……

Answer 2

有作状语和作主语两种情况。追答

作状语：
Having finished my homework I watched TV last night.

作主语：
Having done one's homework is not enough.

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