Réponse :
Bonjour,
a. Americans are the biggest consumers.
big ( adjectif court ) ... the adjectif -est
( doublement de la consonne finale )
b. San Fransisco is the most active city in fighting environmental problems.
active ( adjectif long ) ---> the most + adjectif
c. My city is the least ecological in the country.
superlatif d'infériorité ---> the least ( le moins )
Alexander is the most concerned student about food waste.
concerned ( adjectif long) ---> the most + adjectif
Explications :