Bonjour!
Réponse :
a. She takes a lot of selfies whenever she is on a trip.
b. Modisakeng is an artist who uses self-portraits as a message.
c. It's not always easy to recognise Cindy Sherman.
d. On this self-portrait, Francis Bacon doesn't look very happy, does he?
Explications :
Le verbe "be" au présent simple:
I am
You are
She/he/it is
We are
They are
Quand le sujet est à la 3ème personne du singulier, on ajoute un "s" à la fin du verbe.
ex: she (eat) -> she eats
it (do) -> it does (does est particulier, on ajoute aussi un "e")
He (work) -> works
En espérant que ça t'aide :)