You place a comma before all of the following words: "and", "but", "for", "nor", "or", "neither" and "yet," when these words are being used to join two Independent Clauses into One Sentence.
A clause is a phrase which contains a subject and a verb.
A comma is needed in this example:
I mailed my application on time, but it didn't arrive until after the due date.
A comma is needed, because each phrase is an Independent Clause.
No comma is needed in the following sentence:
I am planning to shop and bake before going to the movies.
No comma is needed because "and" is being used between two verbs, shop and bake.
A comma is also used in a list of nouns. For example, a comma is used in this sentence:
He hit the ball so hard that he ran to first base, second base, third base, and home.
A comma is used because there is a list of nouns.
A clause is a phrase which contains a subject and a verb.
A comma is needed in this example:
I mailed my application on time, but it didn't arrive until after the due date.
A comma is needed, because each phrase is an Independent Clause.
No comma is needed in the following sentence:
I am planning to shop and bake before going to the movies.
No comma is needed because "and" is being used between two verbs, shop and bake.
A comma is also used in a list of nouns. For example, a comma is used in this sentence:
He hit the ball so hard that he ran to first base, second base, third base, and home.
A comma is used because there is a list of nouns.