I'd like to invite you to my birthday on Saturday at 5pm at my home. You can come with a friend, if you like. We'll have a lot of fun, I promise.
Thank you very much, I'll be there with my girl-friend Alice you've already met.
Sorry, but I can't. My parents are taking me to our grandmother's birthday. It's a kind of a family reunion so I can't miss it. I promise to visit you some day this week.
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