A contraction is a condensed spelling of an expression; an apostrophe replaces the missing letters. Use contractions sparingly, if at all, in formal writing.
| cannot |
can't |
has not |
hasn't |
| we will |
we'll |
it is |
it's |
Do not confuse the spelling and punctuation of the contractions it's, you're, who's, they're, and there's with those of the possessive pronouns its, your, whose, their, and theirs.
You're the first one in this family to get your diploma.
There's never been another Wallen to graduate from college. They're especially proud of you, and theirs is a proud family.