Réponse :
il faut que tu rajoute er devant l'adjectif quand il est court(1 syllabe) et more devant l'adjectif quand il est long( plusieurs syllabes)
Explications :
1) ...was heatlier than.......
2) was more famous than...
3) was yougner than.....
4) was born earlier than..
5) was more brutal than
6) are more difficult than....
voila *_* de rien :)