A good source for answers to TESL and other linguistics questions is
'Ask a linguist', a service run by the Linguistic Society of America. URL:

http://linguistlist.org/~ask-ling/index.html

Queries are forwarded to an appropriate expert.
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Johanna Rubba   Assistant Professor, Linguistics
English Department, California Polytechnic State University
One Grand Avenue  • San Luis Obispo, CA 93407
Tel. (805)-756-2184  •  Fax: (805)-756-6374 • Dept. Phone.  756-259
• E-mail: [log in to unmask] •  Home page: http://www.calpoly.edu/~jrubba
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"Understanding is a lot like sex; it's got a practical purpose,
but that's not why people do it normally"  -            Frank  Oppenheimer
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