Apostrophes and contractions and Colloquial phrases:
apostrophes create contractions combining two words
Colloquial phrases use apostrophes to remove syllables of words ('burbs) or combine three words together (rock'n'roll)
Apostrophes and plurals or letters:
Capital letters and abbreviations ending with capital letters are pluralized by adding s alone
Use an apostrophe before an s with uncapitalized letters and where confusion may occur
Numbers expressed in figures are pluralized with adding an s
Apostrophes forming possessives with nouns
for regular singular nouns, an apostrophe plus an s creates a possessive noun
For regular plural nouns, an apostrophe forms a possessive noun
For plural nouns that don't endwith s, add an apostrophe plus an s to form a possessive noun
Place to apostrophe at the end of the singular nounwithout an additional s if it would make the pronunciation difficult
if a new syllable is formed, add an apostrophe plus an s
more about apostrophes forming possessives:
to form the singular possessive of a compound noun, add an apostrophe plus an s to the last element of a compound
To form the plural possessive of a compound noun, form the plural. if the plural ends in s, add an apostrophe only. If not, add an apostrophe plus an s
To indicate separate possession, addapostrophes to the name of each individual or group
To indicate joint ownership, addapostrophe to the final name alone
To form possessives with pronouns:
the possessive forms of personal pronouns don't need an apostrophe
the possessive forms of indefinite pronouns require an apostrophe (anybody's)
forming possessives preceding verbal nouns: when a noun or pronoun modifies a gerund, the noun or pronoun should be in the possessive
apostrophes indicating the omission in figures in dates: an apostrophe is used to represent the missing figures
Apostrophes for the measurement of feet: Apostrophes can be used as a tool to measure feet, but so can dashes. You can't mix dashed and apostrophes in the same sentence for the same purpose