Linguistic classification of English vowels.

According to the lip position vowels can be divided into rounded (lips are drawn together [ɒ, ɔ:, ʊ, u:]) and unrounded (lips are neutral or spread [I, i:, e, ǣ, ǝ, ɜ:, ɑ:, ˄ ].

According to the stability of articulation there can be: monophthongs (articulation is almost unchanging), diphthong s (speech organs glide from one vowel position to another within one syllable).

Accrding to the horizontal position of the tongue there can be:

Front vowels [i:, e, ǣ]

Front-retrected [i]

Central [ ˄, ɜ:, ǝ]

Back [a:, u:, ɒ, ɔ:]

Bak-advanced [ʊ].

According to the vertical position of the tongue vowels can be:

Close [i:, i, ʊ, u:]

Open [a:, ɒ, ǣ]

Mid-open [e, ˄, ɜ:, ǝ, ɔ:]

1. 18 Assimilation of consonants. Types of assimilation.

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