[The phrase based off is an improper form derived from the phrase "based on."]
You already did. =)
You had to take your hat off to him based on his success.
I will fair off if i stick to my dreams
The calendar we use is based on the sun. Did you know that some calendars are based on the moon?
the captain told the crew to knock off.
He was off of the medication for nearly a year now.
He tried to ward off the evil spirits.
They meandered off the trail.
he was hanging off of a cliff.
Tenochtitlan is an ancient country that was based in Mexico. This is the sentence using the word Tenochtitlan.
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.
I usually respond based on the context of the conversation.