1. Use an apostrophe in contractions.
2. Use an apostrophe to indicate the possessive case of nouns and indefinite pronouns.
3. Use an apostrophe in plurals of lowercase letters and abbreviations followed by periods and (preferred) in plurals of capital letters, figures, abbreviations not followed by
periods, and words referred to as words.
Informal messages may include contractions, but they should be avoided in formal writing.
3. Use an apostrophe in plurals of lowercase letters and
abbreviations followed by periods and (preferred) in plurals
of capital letters, figures, abbreviations not followed by
periods, and words referred to as words.
Informal messages may include contractions, but they should be avoided in formal writing.

1. Use an apostrophe in contractions.
- will not ÄÄ won't- have not ÄÄ haven't
- it is ÄÄ it's- cannot ÄÄ can't
- could not ÄÄ couldn't- should have ÄÄ should've
- you are ÄÄ you're- that isÄÄ that's
ᚠDO NOT use a contraction in the possessive pronoun its.
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examples : A P O S T R O P H E <:: examples Rule 2
2. Use an apostrophe to indicate the possessive case of nouns
and indefinite pronouns.
- the cat of Mary
Mary's cat
- the guess of anybody
anybody's guess
- the throw of a stone
a stone's throw
- the papers of students
students' papers
- the house of Bob and Mary
Bob and Mary's house
- the house of Bob and the house of Mary

Bob's and Mary's houses
examples :
3. Use an apostrophe in plurals of lowercase letters and abbreviations followed by periods and (preferred) in plurals of capital letters, figures, abbreviations not followed by periods, and words referred to as words.

- c's- B's or Bs
- Ph.D's- the 1940's or 1940s
- CPA's or CPAs- %'s or %s
- 8's or 8s- m's