Invite people to the party

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Example 1
You : Would you like to join us in the party tonight?
Friends : Sure.
You : Ok. See you at Peter's house tonight at 9 pm.

Example 2
You : Are you coming to the party tonight?
Friend : I'm afraid not.
You : How come?
Friend : I have to study for an exam tomorrow.
You : Well. In that case, I will have to let you go.
Friend : Sorry. Maybe next time.

Example 3
You : Do you want to join the party tonight?
Friend : I wish I could but I have to visit my grandmother.
You : That's alright.