Personally, I think you need to answer this question yourself because if you do end up talking to your parent/teacher, then it wouldn't be exactly like the way I describe how I do it, but anyways:
I can lock eyes with them to make sure they know I'm listening and not disregarding what they say, I could also keep still to be able to hear what they are saying and not be distracted by other things around me.
After I listen to what they say, I'll answer what they are asking based on what I know or what they have asked. If it's something that I have to answer, then either answer right away if you know it, or let them know that you need a second to reply to their question.
