Breakdown of C'est lui qui a une grave infection pour avoir attendu plusieurs mois.
être
to be
une
a / an (feminine)
ce
it / this (with être)
qui
who
pour
for
lui
him / to him / to her (indirect object)
avoir
to have
le mois
the month
grave
serious
attendre
to wait / to wait for
plusieurs
several
l'infection
the infection (f)
Questions & Answers about C'est lui qui a une grave infection pour avoir attendu plusieurs mois.
Why do we use pour avoir attendu here instead of just pour attendre?
The structure pour + past infinitive (avoir or être + past participle) is used to explain the cause of something by referring to a completed action. If you used pour attendre, it would mean "in order to wait" (a purpose), whereas pour avoir attendu means "because of having waited" (a cause).
Why is it C'est lui qui and not C'est il qui?
Why is the adjective grave placed before the noun infection?
Why isn't there a preposition like pendant before plusieurs mois?
You can say pendant plusieurs mois to mean "for several months", but in French, the preposition pendant is very often dropped when describing the duration of an action. Simply saying plusieurs mois is perfectly natural and common.
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