(Would you) care to join us?
Do you want to join us? Tom and Mary saw Fred and Sally sitting at another table in the restaurant. Tom went over to them and said, "Would you care to join us?" Mary: Isn't that Bill and Sue over there? John: Yes, it is. Shall I ask them to join us? Mary: Why not? John (after reaching the other table): Hi, you guys! Care to join us? Bill: Love to, but Sue's mom is going to be along any minute. Thanks anyway.