Which one is correct?
- Don't let us stay here, will you?
- Don't let us stay here, shall we?
I have chosen the first one because "let" is used here as "allow" but my colleague made me confused
Well it depends on what you are trying to say, if you are using imperative you dont have to use the "will you" at the end, because is an imperative order!
is not like saying: "it´s a beautiful day, isn´t it?"
And about "Don't let us stay here, shall we? "
You are ordering someone to not let us (we) stay here, shall we is used to talk about when we are part of the group of people you are talking about.
Example: "Let´s go to the mall, shall we?"