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Taken from: https://en.wikipedia.org/wiki/Phonetics
Phonetics  is a branch of linguistics that comprises the study of the sounds of human speech
Taken from: https://en.wikipedia.org/wiki/English_phonology
English phonology
Like many other languages, English has wide variation in pronunciation, bothhistorically and from dialect to dialect. In general, however, the regional dialects of English share a largely similar (but not identical) phonological system.
Phonemes
phoneme of a language or dialect is an abstraction of a speech sound or of a group of different sounds which are all perceived to have the same function by speakers of that particular language or dialect. For example, the English word "through" consists of three phonemes: the initial "th" sound, the "r" sound, and an "oo" vowel sound. 
Consonants
The following table shows the 24 consonant phonemes found in most dialects of English, in addition to /x/, whose distribution is more limited. Fortis consonants are always voiceless, and sometimes aspirated or glottalized, while lenis consonants are always unaspirated and unglottalized, and generally partially or fully voiced.

LabialDental,
Alveolar
Post-
alveolar
PalatalVelarGlottal
Nasalm1n1ŋ
Plosive,
Affricate
fortisptt͡ʃk
lenisbdd͡ʒɡ
Fricativesibilantfortissʃ
leniszʒ
non-sibilantfortisfθ(x)2h
lenisvð
Approximantl1r5j4w3
 The following table shows typical examples of the occurrence of the above consonant phonemes in words.
FortisLenis
/p/pit/b/bit
/t/tin/d/din
/k/cut/ɡ/gut
//cheap//jeep
/f/fat/v/vat
/θ/thigh/ð/thy
/s/sap/z/zap
/ʃ/dilution/ʒ/delusion
/x/loch
/h/ham
/m/map
/n/thin
/ŋ/thing
/j/yes
/w/we
/r/run
/l/left
Vowels 
English has a particularly large number of vowel phonemes, and on top of that the vowels of English differ considerably between dialects. 
trapæ
bathɑːæ
palmɑː
lotɒ
clothɔː
thoughtɔː
kitɪ
fleece
dresseɛ
strutʌ
footʊ
goose
face
price
choiceɔɪ
goatəʊ
mouth
nurseɜː(r)ɜːr
startɑː(r)ɑːr
northɔː(r)ɔːr
forceɔːroʊr
nearɪə(r)ɪr
squareeə(r)ɛr
cureʊə(r)ʊr
commaə
letterə(r)ər
happyi

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