I have trouble understanding the words on, in and at.
I mean, how do I use them. Like I've heard people saying:
-I'm in my way, but I have also heard, I'm on my way?
-I'm at the mall, and then I'm in the mall?
-It's in the home department, why is it in and not on?
-At her birthday party?
-He's in the yellow shirt?
I really need help, and please don't tell me to read books because I've read quite a lot of them; but I'm still having confusion. Please, if you know about a trick to understand them better, let me know. I will really, really appreciate it!