[The phrase based off is an improper form derived from the phrase "based on."]
You already did. =)
I will fair off if i stick to my dreams
You had to take your hat off to him based on his success.
He was off of the medication for nearly a year now.
He tried to ward off the evil spirits.
the captain told the crew to knock off.
Yes, you should use a comma to set off a direct address in a sentence. For example, in the sentence "John, can you please pass the salt?" the comma after "John" sets off the direct address.
he was hanging off of a cliff.
They meandered off the trail.
Do you use commas to off set the phrase as well as
i was rip-off when i purchased the flowers this morning.
The calendar we use is based on the sun. Did you know that some calendars are based on the moon?