Phonological Rules about the influence of adjacent phonemes on the Realisation of Preceding and Succeeding phonemes and suffixes
Phonological Rules about the effect of adjacent phonemes on the preceding or succeeding phonemes
1. When /t/ and /d/ are followed by /i/ or /j/, they become palatalised
  under the effect of these vowels. As a result, /t/ becomes very much like /tʃ/ as
  in institution and , /d/ like /dʒ/ as in education. 
2. When /k/
  is followed by /i/ or /j/, it becomes prevelar. 
3. When /k/ is
  followed by /i:/, it assumes a slightly advanced velar variety and when it is
  followed by /u/ or /u:/, it assumes a slightly retracted velar variety. 
Phonological rules regarding
  the effect of preceding phonemes on the realisation of suffixes  
1. Realisation of the plural morpheme (s or es),
  the third person singular verb morpheme (s or es), the possessive morpheme
  (apostrophe s) and the contracted 'is' or 'has'. 
i. When these morphemes follow / tʃ, dʒ, s,
  z, ʃ or ʒ/, they are realised as / ɪz/ as in matches, washes, and the house’s
  window.  
Similarly the is in ‘The match is’ when
  contracted is pronounced as /iz/  and 'has' in 'he has' when contracted  
ii. When they follow any voiceless consonant
  other than the mentioned in i or a vowel, they are realised as /s/.   Guests, Works, Cock’s tail, That’s = that
  is, or 
The bat's = The bat has 
iii. When they follow any voiced consonant or a vowel
  other than those mentioned in i, they are realised as /z/. Dogs, Reads, Dog’s = of the
  dog, The dog’s = The dog is, He's =He has 
2. Realisation of the past and past
  participle morpheme d or ed in regular English verbs  
i. When the verb ends in /t/ or /d/, this
  morpheme is realised as / 
 ɪd/ as in waited, or
  addedii. When the
  verb ends in a voiceless consonant other than
  /t/, it is realised as /t/ as in guessed or washed.
iii. When the verb ends in a voiced consonant
  other than /d/ or in a vowel, it is realised as /d/ as in grabbed, bagged,
  flowed 
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