How would you use the the word mnemonic in a sentence?
"Please Excuse My Dear Aunt Sally" is a mnemonic for Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction (PEMDAS), which is the order of operations.
The phrase "would of" does not exist. The colloquial contraction is spelled would've meaning would have. The only time you would use "would of" in a sentence is if you were comparing it to something else or trying to suggest the word 'of' to someone. For example, "Would of be a better word to use than have?"
You use the word "an" when you are would usually use the word "a," only you're describing a noun that starts with a vowel or a vowel sound. For example: I have no idea how I would use this word in A sentence. I would like to eat AN apple. I have AN hour to get to my train. My last card was AN ace. I would like to have A manatee as a pet.