His son was left to dispose his legacy and replace him as the chairman of the board.
to dispose his ...不定式在这里作主补还是目的?
而as the chairman..是表示条件么,还是方式?
leave sb to do sth 不定式为宾补。改为被动语态后不定式则为主补。
as介词短语为replace的方式状语。
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