I'm trying to apply this expression to others, and does "in the afternoons" also make sense?
Native speaker’s answer
Rebecca
Yes, you are absolutely correct. You can also apply this plural form to "afternoons". This form means multiple mornings/afternoons, so it is another way of saying "every morning" or "every afternoon". Ex: I take swimming classes in the afternoons. Ex: My mom usually picks me up in the afternoons.