What is Apostophe?
1.
The most butchered punctuation mark in the English language. Apostrophes are used
1) to
indicate contractions,
2) to indicate possession (in some cases), and
3) VERY occasionally to denote a plural (where otherwise the meaning of the sentence would be unclear).
The use of an apostrophe in the contraction "it's", (which means "it is"), but not in "its", (which is a possessive) causes problems for many people who didn't pass third grade.
Incorrect: Screw you moran's. Go USA.
Incorrect: Its raining cat's and dog's.
Incorrect: Here come's the train. Grab it's cargo.
Correct: Don't go in that room.
Correct: The cat's litter box is dirty.
Correct: Mind your p's and q's.
(the above is one of the ONLY CORRECT USES OF AN APOSTROPHE TO DENOTE A PLURAL. FOR THE LOVE OF GOD IF YOU'RE UNSURE, JUST LEAVE THE APOSTROPHE OUT.)