Observez

a. Thanks to having tweenage daughters, I am familiar
with that music scene.
b. Joe and I were driving to LA. without the kids.
They kept singing.
a. My youngest began singing..
e. They were annoyed at being interrupted.
"How do you know this song?" they demanded,
with insulting emphasis on "you."

Déduisez

Relevez les formes V-ing et classez-les en trois
catégories :
adjectif
- gérondif / nom verbal
- partie de la forme be + V-ing.
Justifiez vos choix.