what rule is this
Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.
Rule 7
The pilots chatted, they looked at the map, they prepared for lift off, and they greeted the passengers.
Rule 5
A comma is used to separate the name of a city from the name of the state or country.
Rule 11
Running to catch the bus, John tripped and dropped his coffee.
Rule 9
Use a comma after an introductory participial phrase.
Rule 9
Rule 12
In the middle of the night, that noise scared the youngsters.
Rule 8
THE COMMA WITH INTRODUCTORY WORDS
Rule 4
Jack said, "You may use this pencil.”"That pencil looks very familiar," replied Bill."Well," Jack said, "it should. You lent it to me!"
Rule 15
Set off names in a direct address
Rule 2
Separate with a comma any nonessential words or groups of words from the rest of the sentence.
Rule 5
My friend was born on July 21, 1978 in Wakefield, Virginia.
Rule 1
Use commas to set off nonessential clauses and nonessential phrases.
Rule 13
The coach, whose team has won two championships, will retire this year.
Rule 13
After introductory prepositional phrases
Rule 8
You need to use commas to set them off
Rule 15
The model is a tall, handsome man.
Rule 6
Separate two or more coordinate adjectives
Rule 6
Greg, are you going to apply for
summer work this year?
Rule 2
Set off the salutation of a friendly letter and the closing of any type of letter.
Rule 14
Use a comma before and, but, or, nor, for, so, or yet to join two independent clauses that form a compound sentence.
Rule 3
I plan to buy bread, butter, sugar, and cinnamon at the store.
Rule 7
Set off items in dates and addresses
Rule 1
Though she seemed calm, Jill was nervous
Rule 12
Set off parenthetical expressions
Rule 10