When writing, holidays, product names, and geographic names are capitalized appropriately. Commas are used in the greeting and closing of letters. Apostrophes are used when writing contractions and common possessives.Is there a correct usage of capitalization, punctuation, and spelling in my writing?Do I capitalize holidays, product names, and geographic names?Do I use commas in the greeting and closings of letters?Do I use an apostrophe to form contractions and common possessives?Do I use adje