Conjugation patternq
Verbs in vaincre

Verbs vaincre and convaincre

The peculiarity of "vaincre" (to win) and "convaincre (to convince) is not to take a t in the present tense of the indicative: je vaincs, tu vaincs, il vainc. The verb ends thus in c. This conjugation is obviously a source of doubt and it is better to remember it.

Moreover, the c changes to qu in front of a vowel except the u in order to keep the sound k: nous vainquons.