Possessive forms. The apostrophe. The writing sample contained 269 a's and 934 e's. Plurals of words (when referring to the use of word itself): The number of maybe's from the survey takers was highest for question 5. Please note that apostrophes are not recommended when naming a decade or pluralizing a number (e.g., write 1990s, not 1990's). These are not the only uses for apostrophes, but.