Weak and strong vowels have already been discussed (see Weak vowels, second week).
Now we return to this subject.
When a vowel occurs in an unstressed syllable in English, it often becomes REDUCED to schwa
or the KIT vowel
or the FOOT vowel
.
This is shown in the following diagram.
In this diagram, the vowel chart divided into three regions: high front (the
region), high back (the
region) and non-high (the
region). When reduced, vowels in each region become
,
, or 
according to their position on the vowel chart.
(Note that when final or before other vowels,
and
become
and
. If you need reminding of this, look again at Tensing of
and
)
In the following table, the words accept, obtain, Brighton, brighten are firstly transcribed INCORRECTLY, with STRONG vowels, and in the third column with their correct weak vowels:
accept |
      |
       |
obtain |
     |
      |
Brighton |
      |
      |
brighten |
      |
      |
Lenin and Lennon
In RP and many other accents, weak
and weak
are in contrastive (overlapping) distribution - they can differentiate between minimal pairs such as:
Lenin |
      |
 |
Lennon |
      |
except |
       |
accept |
       |
BUT...
The weak vowel schwa is quite a tough character. It seems to be taking over from the other two weak vowels,
and
. Unstressed structural words like 'to'

and 'you' 
are very often pronounced

and

(see weak forms). In many accents of English - in Australia, NZ and S.Africa, much of the North of England and widely in the USA and Canada - vowel reduction also turns the KIT vowel
into schwa. In these accents, 'Lenin' and 'Lennon' are homophones, and so are 'accept' and 'except':












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