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A colon, which is usually preceded by an independent clause, introduces a restatement, an amplification, an explanation, or a list or series.

Use a colon when there is no connective or one like "the following" or "as follows:"
            He has a few things to do: work, loaf, sleep, read, and eat.

Do not use a colon after a conjunction or a preposition, or to separate the verb from what follows.
Slang includes such terms as: hassle, the pits, right on.
Slang includes such terms as hassle, the pits, right on.
The topic of tonight's lecture is: Will issue editors adopt the carefully revised Style Manual?

1. With quotations: A quotation of more than normal length (two sentences or more) is usually preceded by a colon. A shorter quotation is ordinarily preceded by a comma. However, a very short quotation may not need punctuation:
            The dog cried "Yap!"

A quotation preceded by a verb that has a direct object requires a colon:
            She murmured her reply: "Bring soft drinks next time."

A quotation that is not introduced by a verb of saying (comment, shout, murmur, say, etc.) is preceded by a colon:
            He pointed: "Look at the moon!"

2. With capitalization: Capitalize a complete sentence that follows a colon or a statement or list that is long and involved, even if it is not a sentence:
            Some riddles have always haunted men: Where did the moon come from? Of what is it made?