This is from the lesson- c’est is used when making statements or giving opinions about something in general or nonspecific. The adjective that follows is always masculine. (Sorry, it’s in my notes so not sure if direct quote but probably is.)
Question: Is it not only always masculine but singular as well?
Eg. Tu aimes les montagnes? = You like mountains? (In general)
Would it be - Oui, c’est magnifique!
This question is not specifically in the above lessons:
My understanding is you use il/elle est or ils/elles sont with unmodified religions, nationalities or professions. Is this correct?
Il est professeur. Elles sont catholiques.
BUT if the noun is modified, then use c’est or ce sont plus an article/determiner. Is this correct?
C’est un professeur d’histoire. Ce sont mes amies françaises.
Thank you for your help!