1-A punctuation mark used by morons and idiots to pluralize words or to conjugate verbs in the third-person singular form.
2-A punctuation mark used to show possession of something.
3-Shows omission of one or more letters within a contraction
4-(American system) Used to set aside quotations within quotations.
1-He want's to see his parent's.
2-"Bob's X"==the X belonging to Bob.
3-couldn't, they're, he'll, I'm, you'd
4-Then, Mark said, "Dude, I hate to tell you, but Sheila said 'I wouldn't go out with him if he were the last man on earth.' Tough break, man."