In my opinion, it is funny too the you case. If someone kindly says me:
We are going to travel a lot this summer, therefore we could go to the beach together!
is he trying to be alone with me (uh, uh) or he wants to chat about the Football World Cup with my bf - this is, is a collective invitation-?
Hey, I invite you to dinner at home!
1) You can only distinguish between the you+boy 'we' and the you+girl 'we' by the context. Use their names if you need to, to avoid confusion. 2) Again, you will have to work this one out depending on the circumstances, who is inviting you, what you are being invitied to, their tone of voice etc.
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