When Should I Add Apostrophes? - Punctuation for Meaning
ome students confuse plurals, apostrophes, and
More than one item is indicated by only plurals, not apostrophes.
He has two papers due next week. NOT . . . two paper's
Apostrophes indicates possession (except for possessive
pronouns). For example,
My group's high grade made us proud of our effort.
Contractions should not be confused with possessive pronouns.
What do you mean "You're not going to your 8:30 class
They're going to their house, not over there.