Breakdown of C'est lui qui se vante d'avoir acheté les gobelets.
qui
who
lui
him / to him / to her (indirect object)
avoir
to have
acheter
to buy
c'est
it is, that is
de
to (introducing an infinitive after a verb)
se vanter
to boast
le gobelet
the cup (plastic or paper)
Questions & Answers about C'est lui qui se vante d'avoir acheté les gobelets.
Why is the verb conjugated as se vante here?
Where does the d' before avoir come from?
Why do we use avoir acheté instead of a regular past tense like a acheté?
This is the past infinitive. When a verb follows a preposition like de, it must be in the infinitive form. Since the buying already happened, we use the past version of the infinitive, formed with the infinitive avoir plus the past participle acheté. It translates perfectly to the English "having bought".
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