- Apostrophes are used to mark the omissions of letters and figures in the contractions of words and word combinations.
- class of '04
However, apostrophes are not used in abbreviations or the shortened form of some words.
- Sgt. (rather than Sg't)
- Apostrophes are sometimes used to form the plural form of letters, numbers, words, and abbreviations.
- x's and o's
- 2 by 4's
- three 7's or 11's
- two CD's or DVD"s
- do's and don'ts
- Apostrophes are used to create the possessive form of nouns and indefinite pronouns, abbreviations, phrases, quotations, and words constructed from numerals. Click here for details on possessives.