An indefinite article signals that the --"Take It or Leave It," Valley Comic News See Usage Rules for Articles for further informationabout how indefinite articles are used in sentences. Also see Copyright ©2001 The McGraw-Hill Companies. Any use is subject to the Terms of Use and Privacy Policy. McGraw-Hill Higher Education is one of the many fine businesses of An airplane's shadow is virtually the same sizeregardless of its altitude. [An signals that airplaneis an arbitrary example, that more than one airplane exists.]The Greenhouse Effect is a theory in environmentalscience which warns of the warming of the globe due to anincrease in carbon dioxide in the atmosphere. [Other theoriesexist; the first time an increase is mentioned, it is new to thereader.]
## Indefinite Articles ##
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