Uses of a colon 1 Explainations - a colon usually introduces an explaination or further details 2 Lists - a colon can introduce a list 3 Subdivisions - a colon can introduce a subdivision of a subject 4 Letters - Americans usually put a colon after the opening salutation in a business letter. Dear Mr Callan: I am writing (Bristish usage prefer a comma or no punctuation mark at all in this case. 5 Direct speech - Normall ydirect speech is introduced by a comma in writing, but a long passage of direct speech may be introduced by a colon.
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