Even someone like me who could clearly communicate, listen, or even know terms more complex than adults trice my age then.
Let alone who doesn't seem like it. Whether they do explicitly stated that we can hear and understand, or not.
My mom caught on somewhat that she won't talk about my case to anyone in front of me.
Yet, she isn't all-aware that I can still hear other things from afar and from others. Or sense from someone else that they knew my case without my consent.
Then there's my funny habit of eavesdropping on random occasions.
Some would talk about confidential stuff in front of me. I could even go in front of them, and have the entire room ignore my presence because of such assumption.