Usage of "shall we?"

What does it mean and where would I use it?

Solution 1:

If you are in a situation where a group is gathering to do something (go out for lunch, start a meeting, etc.), "Shall we?" would mean something like "Are we now all ready and is it now time to proceed with what we are here for?". (Or more simply, "Should we now proceed?", but that explains "shall" in terms of "should".)

Solution 2:

Shall is used in questions indicating offers or suggestions.

Shall I send you the book?

Shall we go?

Solution 3:

Shall we is a polite expression for Let’s go. A Spanish equivalent would be Vámanos.