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Person A: 'Have a nice weekend!'
Person B: 'You too!'
I usually respond to:
or, less formal:
Of course, to be polite, you could start the response with a "Danke!".
In German you Add First an Danke (Thanks) so you say "Danke, du auch!"
And when you dont want to Add Danke just say "Du auch" or "Dir auch" what means "The same to you"
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