Apostrophes are used in four ways: to show possession (e.g., dog's dinner) in time expressions (e.g., 2 years' pay) in contractions (e.g., isn't) to show awkward plurals, but only very awkward plural (e.g., i's and a's)

Apostrophes have two main uses: Indicating possession (e.g., The student’s paper) Indicating a contraction (e.g., She’s writing a paper) Contractions should be avoided in academic writing, but possessive apostrophes are used in all types of writing. Make sure to use them correctly, especially when dealing with plurals and abbreviations.

Apostrophes are used to show ownership and form contractions. For singular nouns, add an apostrophe and an “s” to show possession. For plural nouns ending in “s,” add just an apostrophe. For plural nouns not ending in “s,” add an apostrophe and an “s.”