c'est vs il/elle est vs ce sont

Question

example from this lesson - Et leurs anniversaires ? - C'est bientôt !
contradicts with example from another lesson about c'est vs il/elle est - Où est ta tasse? Elle est sur la table. (rule: use il/elle est when giving opinions/short statements about specific things.)
"C'est" vs "Il/Elle est" to say it is/she is/he is in French

leur anniversaires - we are specifically talking about their aniversaries. so shouldn't we use il/elle est ? or maybe ils/elles sont ?

Jim Jones · Answer

Bonjour Dheeraj https://french.kwiziq.com/revision/grammar/use-notre-nos-votre-vos-leur-leurs-to-say-our-your-and-their-possessive-adjectivesPlease review the link above — I think you are confusing pronouns and adjectives.Bonne continuation Jim