Breakdown of Tu aurais dû le vendre à ce courtier.
tu
you (informal singular)
avoir
to have
ce
this (before a noun)
à
at / to / in (general locations) / about (what one thinks about / reacts to)
devoir
to have to / must
le
him, it (masculine direct object pronoun)
vendre
to sell
le courtier
the broker
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