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A list should be introduced with a colon when the list is preceded by a complete thought. A complete thought refers to a dependent clause, that is a complete sentense which contains a subject and a verb and conveys a complete notion.

A colon is implemented in order to introduce an  item or a list containing a series of items; and it is usually preceded by a complete thought.

A colon should be used to introduce a list only when it is preceded a complete thought.

Using a colon to introduce a list

We say we have a list when we mention three or more items of the same kind in a sentence. Lists can be introduced by a colon only when a complete thought precedes that colon. Take a look at the sentences below:

  • My favorite kinds of fruit are: apples, bananas, pears, and grapes.
  • These are my favorite kinds of fruit: apples, bananas, pears, and grapes.

The first sentence contains an error. A colon should not be employed here because the preceding sentence ends in a verb, which makes its meaning incomplete. However, the second sentence is an example of a colon properly used.

Learn more about lists here:

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