Weak forms.

When we talk about weak forms in the phonetics of English this regards a series of words which have one pronunciation (strong) when isolated, and another (weak) when not stressed within a phrase.

Weak forms are usually distinguished by a change in vowel quality from a border position on the vowel quadrilateral to a central position. The vowel in a weak form is usually the schwa (ə). Weak forms are pronounced more quickly and at lower volume in comparison to the stressed syllables. They are also not central to changes in intonation.

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