J’avoue avoir mangé tous les cookies.
I admit to having eaten all the cookies.

Elle avoue avoir oublié de verrouiller la porte.
She confesses to having forgotten to lock the door.

Il avoue avoir menti à ses parents.
He confesses to having lied to his parents.

Nous avouons avoir pris un jour de congé sans raison.
We admit to having taken a day off for no reason.

Ils avouent avoir triché pendant l’examen.
They admit to having cheated during the exam.