I am confused?
I can't hear or don't understand.
Informal clarification.
I want to give support and encouragement.
I need you to explain more clearly.
I want someone else to try it.
Formal clarification.
I see an error.
What?
Could you explain it again?
It's your turn.
What do you mean?
Would you mind repeating that?
That doesn't look right to me. I want to make a change here.
Pardon me? Excuse me?
I think that's it! Well done!