Hello there, Hee Jeong!
Thank you so much for doing your homework! Nodding, reacting, and making eye contact are all great ways to show you're listening. You can also try asking a follow-up question or repeating what the person said to show you're really paying attention.
- Kristine ^^
Nod one's head, give a reaction, make eye contact.
>> You can nod your head, give a reaction, and make eye contact to show that you're listening.