My son will repeat words he hears us say. For example, if I ask him: do you want to go to the park? He will say "Park!" Yet, I know that means no.
I noticed him doing it at school. They said, here is a toy. Do you want it? He replied, want it. But he didnt want it.
So I made a point to tell the Speech path and she said, yes that is echolalia and she does notice him doing it. Then, I observed his language eval today and noticed it more. If she asked him something he didnt know, he just repeated her words. She'd say: what do you do when you're thirsty? And he would just say: thirsty.
He also can say words and short sentences independently. I didn't realize you could have echolalia too.