1. Excuse me: used as a polite apology in various contexts, such as when attempting to get someone's attention, asking someone to move so that one may pass, or interrupting a speaker.
E. g. Excuse me, May I get by.
2. Pardon: a request to a speaker to repeat something because one did not hear or understand it.
E. g. Pardon, please. There's too much noise here.
A. When you accidentally do something wrong. For example, you drop something, or you step on someone accidentally.
E. g. I'm sorry, I was just trying to get up.
B. When you are trying to request someone to do something.
E. g. Sorry, would you mind shifting to the next seat?
4. What!?: This is an informal way of saying 'Excuse me'. Also, it is more often used in a negative, surprised or interrogative tone.
E. g. Jack: I didn't get your book. I thought I could keep it longer.
Mark: What!? We have an exam tomorrow! How am I going to study now!
5. Forgive me: when you have to leave in the middle of a meeting, or get away from a gathering to attend another one.
E. g. Forgive me, I will need to go now. I have to attend a meeting at 5.
6. I beg your pardon: When you don't get what the other person just said.
E. g. I beg your pardon. Could you repeat the number?
Note: After burping, sneezing etc. , you could say "excuse me", although you could also use "I'm sorry. "
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