Bonjour !
a. They like our house but they prefer theirs.
b. Her bedroom is larger than my bedroom, but mine is more comfortable.
c. "Do you like their coach ?"
"Well, we think that's much stricter than ours."
Explications :
Pronoms possessifs anglais : Mine/Yours/His/Hers/Its/Ours/Yours/Theirs.
J’espère t'avoir aidé. Bon courage !