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if you have no intention to do somebody a favour. just decline. to decline is to say NO politely.it s your right to say No whenever you want, wherever you want to whomever you want.
I"m sorry, I can't.
I really wish I could but I have ( an appointment, a test, a family thing to do... etc..)
I am super busy this weekend, but maybe next time.
Actually I am not feeling well, but I wish I could help.
I have out of town company, and they need me to constantly entertain them.
I have a ton of chores to do and am so behind on housework, so sorry.
The art of making excuses.