Breakdown of J'ai pu prolonger mes vacances.
je
I
avoir
to have
les vacances
the vacation / the holidays
mon
my (mon, ma, mes)
Questions & Answers about J'ai pu prolonger mes vacances.
Why does J'ai pu translate to "I managed to" rather than just "I could"?
How would the meaning change if I said Je pouvais prolonger?
Why is the word for "vacation" plural (mes vacances) here?
Why is prolonger left in the infinitive form?
Prolonger is in the infinitive because it immediately follows the modal verb pouvoir. Even though pouvoir is conjugated in a compound tense (J'ai pu), the rule still applies: the main action verb that follows it must remain in its dictionary form.