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A comma is used in the middle of, and never at the end of a sentence. This is done to make the sentence clearer, especially to separate items in a list. However, overusing commas can complicate a sentence, or render it meaningless. A comma is important to avoid any possibility of misunderstanding a sentence as the following example shows:

While my father was eating, my mother was drinking.
While my father was eating my mother was drinking.
Without the comma, it appears my father was cannibalizing my mother.

 

A comma is used:

Example: We saw monkeys, porcupines, lions and tigers in the zoo.

 

Example: Yesterday, as I was jogging in the park, I saw a black baboon.

 

Example: He told us, "I believe the world is flat."

 

Example: "Jane, let me show you how to do it."

 

Example: He is marrying on Tuesday, 1st April.
Example: The explosion happened on 1st January, 2000.

 

Example: Oh no, it can't be true.
Example: Well, all I can say is it's a waste of money.

 

Example: Of course, you are always right.
Example: Moreover, the rent is high and the location is not perfect.

 

Example: 999, Downing Street, Kingston.

 

Example: Montana, USA.

 

Example: 2,000 / 20,000

 

Example: Dear Princess Diana, / Yours sincerely.

 

Example: The short, puny man was a comedian.

 

Example: The man, who lives next door, is a circus clown.

 

Example: Jack is washing the car, and Jill is washing the dishes.