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I have to
A: That’s too bad. Maybe another time.
B: Sure, Joe. Thanks for asking.
not available.
not free.
afraid not.
prepare for an exam.
go to the doctor.
meet my friend.
…
come to my party
go to the movies
go shopping
play basketball
play ping-pong
…
Make invitations
Accept invitations
Refuse invitations
Can you...?
Summary
Invitation
Sure, I’d love/like to.
With pleasure.
Thanks for asking me.
That sounds a good idea.
Sorry, I can’t. I ...
I’d love to, but...
Thanks for asking me, but...
I’m afraid I can’t.