"Haven't" is an appropriate usage. Anonymous In case you haven't noticed, I changed the color of the walls. Anonymous "In case you haven't noticed , [there should be a reason elaborating the previous caluse] I will tell you this .
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AnonymousIn case you haven't noticed, I changed the color of the walls.
Anonymous"In case you haven't noticed, [there should be a reason elaborating the previous caluse] I will tell you this. I`m quite a celebrity in this town. It would be very easy for me to expose you."