 Coordinators. Coordinators, and, but, so, or, nor, for, yet. Connect elements of equal importance. Subject plus verb, comma, but subject plus verb. A comma is normally used. Subject plus verb and verb. No comma is necessary. Subject or subject plus verb. Noun and noun. Adjective and adjective. Phrase and phrase can be used in a series. A comma, B comma, C comma, or D. Examples. He drinks coffee, but she drinks tea. Subject plus verb, comma, coordinator subject plus verb. Gary lives in Ohio, and Dina lives in Michigan. She loves to dance, so she bought a studio. You could buy a car, or you could put the money in the bank. When there is a new subject and verb, the comma is used before, not after, the coordinator. John and George both play football. Two subjects. Paul listens to music and reads books. Two verbs. John, Paul, George, and Harry are classmates. Series. Four is also commonly used as a preposition, yet can sometimes be used as an adverb.