Long vowels and Reduced Long Vowels

[koster]

I am an English Foreign Language Teacher, and I have been asked by one student I teach privately to help him distinguish between "long vowels" and "reduced long vowels". He needs to be able to do this for a course he is studying which leads to an examination.
I have never taught this and don�t know what they are. Please could someone help me with some examples, preferably minimal pairs, and any tips on teaching this?

Thanks in advance!

Laurence
 

[kempie]

These may be of help

http://www.clsp.jhu.edu/ws98/presentations/preliminary/burzio/abstract.html

http://en.wikipedia.org/wiki/International_Phonetic_Alphabet_for_English

http://www.spellingsociety.org/journals/j10/efl.php

http://www.uta.edu/english/tim/courses/4301f98/2sept.html

http://66.102.9.104/search?q=cache:Y0ys4b5oelAJ:www.uni-greifswald.de/~anglam/staff/Material/Fanning/PronRules.pdf+english+reduced+long+vowels&hl=en%20target=nw

[IndieSinger]

Laurence - are you in Sheffield?

[koster]

Thank you.

"IndieSinger" - no I'm not in Sheffield, I'm in Spain. Why?

[IndieSinger]

Just nosey! I know someone called Laurence who uses the name "koster" and who is an EFL teacher in Sheffield!