Apostrophe in english grammar is used for contractions where noun or pronoun or verb combine. The apostrophe mark (‘) essentially is a spelling device used to indicate the possessive case of nouns.

Rule 1:

As a mark of punctuation, it is used to denote the omission of one or more letters or figures. For example:

  • O’clock
  • Shouldn’t
  • the Spirit of ’76
  • the class if ’63
Rule 2:

Do not use the apostrophe in words that are accepted shortened forms. For example:

  • phone
  • plane
  • cello
Rule 3:

with s to indicate that a thing or person belongs to somebody. For example:

  • My friend’s brother
  • Kind Jame’s crown/ Kind Jame’s crown
  • The student’s books
  • The waitress’s apron
  • The women’s coats
Rule 4

In short forms, to indicate that the letters or figures have been omitted. For example:

  • I’m ( I am)
  • They’d (they had/they would)
  • The summer of’89 (1989)
Rule 5:

Sometimes, with s to form the plural of a letter, a figure or an abbreviation. For example:

  • During the 1990’s
  • Add four 3’s and the result is 12
Rule 6:

If figure is written in words, only ‘s’ is added.

For example: Sachin hit three fours and two sixes.