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Otto Yesperson , Daniel Jones and their colleagues made great contributions to language teaching by developing and perfecting IPA which is extensively used in dictionaries and textbooks.
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Phonetics is different from phonology in that the latter studies the combination of the sounds to convey meaning in communication.
Suprasegmental phonology refers to the study of phonological properties of units larger than the segment-phoneme, such as syllable, word and sentence
[p] is a voiced bilabial stop.
Two sounds are in free variation when they occur in the same environment and do not contrast, namely, the substitution of one for the other does not produce a different word, but merely a different pronunciation
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