The #1 homophones not to mix up while learning French is the a (from the verb avoir – conjugated in present tense, 3rd singular person) – and the à (preposition) duo.
Although we did cover both in previous posts, what makes them different makes much more sense when directly highlighted.
Can you conjugate it in the imperfect tense or not?
If you can replace a by avait in the sentence you are about to formulate, then you have to use the verb a.
E.g.: Il a beaucoup de style
Otherwise, it is the preposition à, written with the accent grave on top.
E.g.: Il ne nous reste plus qu’à voter.
This simple mnemotechnics works every time. No exception. Cool right?