"You're" is a term used to describe someone, e.g. "You're cool" "You're awful" either positively or negatively.
"Your" is a term to describe someone's property or maternal/paternal relatives, e.g. "Where's your aunt" "Here's your suitcase" usually used in a gray area between moody and happy.
"Grammer" is a common misspelling of the term "grammar", used to describe someone's verbal accuracy in written form, e.g. "Mouhf (incorrect spelling)" "Mouth (correct spelling)"
Checkmate.
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