Assimilation is a phonetic process where a speech sound becomes similar to a neighboring sound. There are two main types: regressive assimilation, where a sound is influenced by the following sound; and progressive assimilation, where a sound takes on characteristics of the preceding sound. Specific examples of assimilation discussed in the document include assimilation of voice, place, coalescent assimilation such as yod-coalescence, and fricative devoicing.

1. • A general term in phonetics for the process by which
a speech sound becomes similar or identical to a
neighboring sound.
• It is often defined as a process of replacing one sound
(or changing some properties of a sound) under the
influence of another sound which occurs near it.

2. 
A sound is influenced by the sound which
follows it: regressive assimilation
A ⇐ B
A sound takes on characteristics from a sound
which precedes it: progressive assimilation.
A ⇒ B
Two segments merge into one, and a
qualitatively new sound is formed: Coalescent
Assimilation
(A ⇔ B → A/B) (A ⇔ B → X)
Depending on the direction of the influence:

3. 
Assimilation of Voice
Assimilation of Place
Coalescent Assimilation-
Yod Coalescence
Fricative Devoicing
Types of
ASSIMILATION

4. 
 Regressive
-of course / əf kɔːs /
-supposed to / səˈpəʊst tə/
-used to /juːst tə/
-newspaper /ˈnjuːspeɪpə/
- have to /hæf tə/
 Progressive (Established cases)
-the weakest form of IS/HAS
-the genitive case
-the third person singular morphene
-the preterite morphene
-the plural morphene
Assimilation of Voice
/ˈdʌzənz/

5. 
/t/ FOLLOWED
BY /p/ /b / / m/
BECOMES
/p/
/d/ /b /
/n/ /m/
Assimilation of Place
/t/ FOLLOWED
BY
/k/ /g/
BECOMES
/k/
/d/ /g/
/n/ /ŋ/
/s/ FOLLOWED
BY /s/ /z / /ʃ/ /ʒ /
BECOMES
/ʃ/
/z/ /ʒ/

6. 
 1- /t/ + /j/ = /tʃ /
Nice to meet you
meet + you /mi:t jʊ/ = /mi:tʃʊ/
 2- /d/ + /j/ = /dʒ /
Would you like some tea?
would + you /wʊd jʊ/ = /wʊdʒʊ/
 3- /s/ + /j/ = /ʃ /
It's just you = it's jus' you /dʒʌs jʊ/= /dʒʌʃʊ/
 4- /z/ + /j/ = /ʒ /
learning centres such as universities
as + universities /əz ju:nɪvɜ:sɪtɪz/ = /əʒu:nɪvɜ:sɪtɪz/
Coalescent Assimilation

7. 
/v/
Becomes
/f/
When followed by any voiceless
sound
/z/ /s/
/ʒ/
/ /
/ʃ/
/ /
Fricative Devoicing