How do you determine when writing whether to use the word everybody or everyone?

No.

everyone is or are

you can use that word in writing whenever you want otherwise it wouldnt make sense to and me

Determine in a sentence could include:I was determined to win the race.orShe determined the answer to the math problem first and won a piece of candy.Hope this helps! :)

Cacophony - A loud, harsh and unpleasant sound.I hope this is a good reference