When do you use “a”, “as” or “à” in French?

“a” is the verb “avoir” (to have) conjugated in the present tense, third person singular (Il/elle a = he/she has). e.g : Il a du chocolat à He HAS chocolate. “as” is similarly the verb “avoir” but with the second person singular (tu as = you have). e.g : Tu as du chocolat à you HAVE chocolate. “à” on the other hand is a preposition, it’s the French equivalent for the English “to”. e.g : Je donne mon chocolat à ma mère à I give my chocolate TO my mother. or : Je vais à Paris à I am going TO Paris.