Regressive Assimilation

(b)  Regressive Assimilation

(i)  Place assimilation   Bilabialisation of Alveolar Sounds

       Alveolars  -----  [t, d,  n]

       Bilabials -----    [p, b, m]

 ----- / t /  changes to  / p / before [p], [b] or [m]

                    

                     Slow                     fast                  Description

great person   [greIt p3:sn]    -----  [greIp p3:sn] ----- [greIp3:sn]

great buy        [greIt baI]  -----  [greIp baI ]  -----  [greIbaI]

great man       [greIt mӕn]    [greIp mӕn]  -----  [greImӕn]

-----  / d / changes to / b / before [p], [b] or [m]

bad person   [bӕd p3:sn] -----  [bӕb p3:sn]  -----  [bӕp3:sn]

bad buy        [bӕd baI]  -----  [bӕb baI]      -----  [bӕbaI]

bad man       [bӕd mӕn]  -----  [bӕb mӕn]  -----  [bӕmӕn]

à  / n / changes to / m / before [p], [b] or [m]

ten persons   [ten p3:snz]  -----  [tem p3:snz] ----- [temp3:snz]

ten boys       [ten bɔIz]  -----  [tem bɔIz] -----  [tembɔIz]

ten men        [ten men]  -----  [tem men]  -----  [temen]

(ii)  Place Assimilation -----  Velarisation of alveolar sounds

      Alveolars   [t,  d,  n]

      Velars      [k,  g,  ŋ]

-----  / t / changes to / k / before [k] or [g]

smart card  [smɑ:t kɑ:d]  -----  [smɑ:k kɑ:d]  -----  [smɑ:kɑ:d]

smart girl    [smɑ:t g3:l]  -----  [smɑ:k g3:l]  -----  [smɑ:g3:l]

-----  / d / changes to / g / before [k] or [g]

dead cock  [ded kɒk]  -----  [deg kɒk]  -----  [dekɒk]

dead goat  [ded gəUt]  -----  [deg gəUt]  -----  [degəUt]

-----  / n / changes to /ŋ / before [ k ] or [ g ]

ten cooks  [ten kʊks]  -----  [teŋkʊks ]

ten girls   [ten g3:l]  -----  [teŋg3:l]

(iii)  Place Assimilation ------  Palatalisation of Alveolar Sounds

-----  / s / changes to / ʃ / before / ʃ / or / j /

bus shelter  [bΛs ʃeltə(r)]  -----  [ bΛʃ ʃeltə(r) ]  -----  [bΛʃeltə(r)]

dress shop   [dres ʃɒp]  -----  [dreʃ ʃɒp]  -----  [ dreʃɒp]

space shuttle  [speIs ʃΛtl]  -----  [speIʃ ʃΛtl][]  ----- [speIʃΛtl]

this year        [ðIs jIə(r)]  ----  [ðIʃ jIə(r)]  -----   [ðIʃjIə(r)]

-----  / z / changes to / ʒ / before / ʃ / or / j /

cheese shop   [ʧi:z ʃɒp]  ----- [ʧi:ʒ ʃɒp]  -----  [ʧi:ʒʃɒp]  

these sheep   [ði:z ʃi:p]  -----  [ði:ʒ ʃi:p] ----- [ði:ʒʃi:p]

wise young man  [waIz jΛŋ mӕn] -----  [waIʒ jΛŋ mӕn]

1. / t / changes to / p / before / m / / b / or / p /
2. / d / changes to / b / before / m / / b / or / p /
3. / n / changes to / m / before / m / / b / or / p /
4. / t / changes to / k / before / k / or /g/
5. / d / changes to / g / before / k / or / g /
6. / n / changes to /ŋ/ before / k / or / g /
7. / s / changes to /ʃ/ before /ʃ/ or / j /
8. / z / changes to /ʒ/ before /ʃ/ or / j /

/θ/ changes to / s / before / s /

tedpower.co.uk/assimilation.html

  

More examples 

a nice man  |ə'naIs+̩ mӕn|

an ice man  |ən+'aIs̩mӕn|

nitrate         |'naI+̩treIt|

night-rate     |'naIt +̩ reIt|

cargo           /' kɑ: g əυ  /

that pen       /ðæ'pen/

 dust bag      / 'dʌsbæg/

best maid     /bes'meId/

red pen        / re'pen/

bad boss       /bæ'bɒs/

dead mouse  / de'maυs/   

ten marks     /te'mɑ :ks/

that car        /ðækɑ : (r)/

dead goat     /de'gəυt/

hen coop      /heŋ'ku:p/

ten girls        /teŋ'g3:lz/