Uses of the Colon in English Writing

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1. Introducing a List or an Appositive


Right or Wrong ?
The ingredients for the chocolate cake : flour, cocoa, butter, eggs, sugar, and vanilla extract.

Wrong ! The above sentence includes a list of cake ingredients introduced by a colon. A colon is indeed expected to introduce a list but the text preceding it must constitute an independent clause making up a sentence that can stand alone. As the preceding text is merely a noun phrase and not an independent clause answering to the double requirement of both subject and predicate, placing the colon here is wrong. A correct wording would therefore be:

We need several ingredients for the chocolate cake : flour, cocoa, butter, eggs, sugar, and vanilla extract.


If you want to know more, read the rules for colon usage below:


1. Use a colon after an independent clause that introduces and states the nature of the list that follows. The preceding sentence must include a phrase that serves as a generalizing term common to the list elements.
If you want to improve your cooking, you can do three things : read cookbooks, go to cooking classes, and            cook as much as you can.
[preceding text is a stand alone sentence including an independent clause; three things is a generalizing term introducing the list items]

Your dishes will be judged according to four criteria : taste, culinary level, cooking skill, and presentation.
[preceding text is an independent clause; four criteria is a generalizing term introducing the listed items]

2. If the introductory independent clause ends in the expressions such as, including, like or consists of, do not use a colon.
The contestants prepared various kinds of ethnic dishes such as goulash, sauerkraut, empanadas, and Beef    Bourguignon.

3. If the introductory independent clause ends in the expressions the following or as follows, you must use a colon.
The contestants prepared the following kinds of ethnic dishes : goulash, sauerkraut, empanadas, and Beef    Bourguignon.

4. Put a colon after the introductory sentence when the list items are written vertically.

5. An appositive is a word or group of words that rename a noun or a pronoun. When an appositive is introduced by an independent clause, use a colon. When the introductory text is not an independent clause, use a comma.
Trained chefs are supposed to know how to prepare a proper Beef Bourguignon : prime meat cubes cooked in a full-bodied red wine, aromatic vegetables and fresh condiments.
[Beef Bourguignon is renamed in the appositive after the colon, detailing what it is made of]

2. Introducing the Text that Follows


1. When a second independent clause explains or summarizes a preceding independent clause, you can use a colon to separate them. In this way, the colon serves as a prompt alluding to the second clause as being an answer to an implied question raised in the first independent clause.
There is a vital issue every chef has to consider : Will the soufflé rise properly or dramatically collapse in front of the guests ?
[implied question: What is the vital issue? Answer: The rise and fall of the soufflé]

I will always remember the first time my husband cooked for me : It was a charming Friday Evening with a  romantic candle light dinner he prepared.
[implied question: What was the first time like? Answer: A Friday evening candle light dinner]

2. It is sometimes possible to use a colon after an element which is not an independent clause, but merely a fragment. This is permissible only if it is logical for the fragment to stand on its own. Take care, however, that beginner writers should avoid this, as the ability to judge when such instances are possible develops with time and experience.
So far so good : The soufflé looks as if it is going to rise impressively. The guests are not going to get disappointed.
[implied question: What's good ? Answer: The soufflé will rise]

3. Strengthening Connections or Adding Examples

1. When one unit of information expands or derives from another, consider putting a colon in between them. This makes the relation between the two units more obvious as it alerts the reader to regard the latter unit as significant to the former. This rather advanced use of the colon enables connecting two sentences together in an elegant and more concise manner, as it saves up on some wording.
The new club president was elected by an extremely narrow margin. The count was 8,756 in favor and 8,250            against.
[The reader has to put in some thinking in order to realize the purpose of the given figures as related to the election results]

The new club president was elected by an extremely narrow margin : 8,756 in favor and 8,250 against.
[The colon makes the connection between election results and figures clearer]

2. You can consider using the colon to emphasize a point you want the reader to pay attention to. Instead of putting the related elements in separate sentences, juxtaposing them with a colon makes the relation - usually that of a contrast - more forceful.
A poor homeless child was sentenced to 6 months in prison. His crime was that he stole a few apples and some bread to feed his starving brothers and sisters.
[two separate sentences, no special emphasis]

A poor homeless 8-year-old child was sentenced to 6 months in prison. His crime : stealing a few apples and          some bread to feed his starving brothers and sisters.
[The colon emphasizes the unjust contrast between the child's age and poor status and the punishment he received]

4. Other Uses of the Colon

1. Use a colon to separate between numbers in a ratio. In case these numbers are written as words, use the word to instead of a colon.
Chef Roberto defeated Chef Castellans 4 :1 (four to one) at the regional cook-offs.

2. Use a colon to separate the hours from the minutes and seconds.
The marathon winner passed the finishing line at 2:23:05.

Notes
-The British style is to use a period instead of a colon.
We arrived at the restaurant at 5.45 in the afternoon.

-In military settings, hours and minutes are written without colons with four digits on a 24-hour clock.
The morning shift starts its guard duty at 0730, and the evening shift at 1700.

3. Use a colon to separate a main title from a subtitle in books, articles etc.


4. Use a colon to separate Bible chapters and verses.
Look it up in Psalms 14: 4-8 and compare to Genesis 23, 23-24

5. Use a colon in memos.


7. When an independent clause introduces a quotation or spoken text in a dialog, use a colon. If the introductory text is not an independent clause, use a comma instead.
Chef Roberto won the cooking contest and said excitedly : "I would like to thank my grandmother for teaching me everything I know. "
[introductory text is an independent clause]

He said ,"I would like to thank my grandmother for teaching me everything I know. "
[introductory text is not an independent clause which can stand alone]

8. Use a colon to separate lower level subheadings and figures or table identifiers from the text that follows them.


9. Use a colon to separate characters' names from their lines in scripts and screenplays.
Chef Roberto : "To cook or not to cook, that is the question. "


5. Colon Style Conventions


1. You may leave one or two spaces following a colon. Be consistent with any option you choose.
2. When a colon appears after quoted text, put it after the closing quotation mark.
3. Italicize the colon in case it appears immediately before an italicized text.
4. Start the text following the colon with either an upper-case or lower-case letter. Be consistent with any option you choose.

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