We ’ re going to the movies . Will you join us ?   I ’ m very sorry I can ’ t .   Why not ?   I ’ m afraid I have some business to attend to .   Then would you like to have lunch with us ?   I ’ d love to but I have to help John with his math problems right now .   Would you like me to give you a lift ?   No , thanks . His home is not far and I can walk there .   Come on . It ’ s no trouble at all .   Ok , thank you . 