Place a comma after an interjection.
Wow, that was a good movie.
Yikes, I forgot my wallet.
Hey, have you seen my coat?
An interjection is an interrupter word placed at the beginning of a sentence. Always put a comma after an interjection.
▶It’s your turn. Place a comma into this sentence. Well it’s time to be going. Did you figure it out? Good for you.