On peut dire aussi "Je puis", je crois. Mais c'est pas accepté dans les quiz. Pourquoi?

Hi Jose - "Je puis" is an archaic form that is almost never used except in very formal situations (mostly written). You would use "Puis-je ... ?" as a question, but in almost all cases "Je peux ..." is the correct way to say "I can". In the context of the sentences in the kwizzes, "Je puis" isn't really correct because it would sound strange.