Between items in dates and addresses. Michael arrived at Ellis Island, New York, On February 14, 1924.Between words in a list. I bought apples, bread, candy, meat, and vegetables.
Between adjectives. He bought a very beautiful, big, red car.
Before and after quotes with tags. She said, 'I am hungry.' 'I am hungry,' she said.
Around nonessential clauses and appositives. Matt's mother, Jane (appositive), who has trouble with directions (nonessential clause), had to ask for help.
After introductory words. Hoping for the best, we checked our luggage.
Before conjuntions. I went grocery shopping, while my mother did the laundry.