From 769b1bbf55d67130ae5820b5b9f01fd873a94d3d Mon Sep 17 00:00:00 2001
From: Ngô Ngọc Đức Huy <huyngo@disroot.org>
Date: Wed, 21 Apr 2021 23:55:54 +0700
Subject: Write phonology chapter

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 src/haesdaaga/phonology.md | 74 ++++++++++++++++++++++++++++++++++++++++++++++
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 # Hàësdáëga
 
 - [Introduction](./haesdaaga/intro.md)
+- [Phonology](./haesdaaga/phonology.md)
diff --git a/src/haesdaaga/phonology.md b/src/haesdaaga/phonology.md
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+# Phonology
+
+## Consonants
+
+Main consonants are listed in the table below:
+
+|               | labial | alveolar | palatal | uvular    | glottal |
+|---------------|--------|----------|---------|-----------|---------|
+| **nasal**     | m      | n        | ɲ (*nj*)  | ŋ (*n*, *ng*) |         |
+| **plosive**   | p b    | t d      |         | k (*c*) ɡ (*g*)   | ʔ       |
+| **fricative** | f v    | s z      |         | x (*ch*) ɣ (*gh*) | h   |
+| **sonorant**  | w      | ɹ (*r*) l  | j       |           |         |
+
+Notes:
+
+- *n* is pronounced as /ŋ/ only if it is followed by another consonant
+- The glottal stop /ʔ/ is not written. It's implied when a syllable does not
+  have other consonants (similar to Vietnamese).
+- *nj* is pronounced as /ɲ/ even when the two letters are from different words.
+  The sames go for other digraphs (ng, ch, gh)
+- Some dialects may pronounce *s*, *z* as 
+
+## Vowels
+
+|       | front        | centre | back        |
+|-------|--------------|--------|-------------|
+| open  | i y          | ɨ (*uë*) | u           |
+| mid   | ɛ (*e*) e (*aë*) | ə (*oë*) | ɔ (*o*) o (*oü*)|
+| close | a            |        |             |
+
+Notes: In Hàësdáëga's native script all vowels are written as only one character.
+
+### Diphthongs and long vowels
+
+Long vowels are written as duplicated vowels, with the second character having
+a diaresis (for example *aä* is pronounced /aː/). For vowels whose
+romanizations contain two characters, the later vowel is duplicated (for
+example, long version of *aë* is *aëë*)
+
+Diphthongs are written similarly. They're listed below:
+
+- aï /aɪ/
+- aü /aʊ/
+- aëï /eɪ/
+- oëï /əɪ/
+- oÿ /oʏ/
+- uï /uɪ/
+
+## Tones
+
+There are three tones in Hàësdáëga:
+
+- level tone (a) /˧˧/
+- rising tone (á) /˧˥/
+- falling tone (à) /˥˩/
+
+## Phonotactics
+
+Syllables in Hàësdáëga have a simple structure: **CVT(C)**
+
+The final consonants can't be sonorants, /h/, /ʔ/, and voiced vowels if they
+have voiceless equivalents.  Other than that, there isn't any constraints.
+
+There are thus:
+
+\\( 22  × (10 × 2 + 6 )  × 3  × 11  = 18876  \\) (possible syllables)
+
+Note: These numbers mean:
+
+- 22 consonants
+- 10 vowels and their long version
+- 6 diphthongs
+- 3 tones
+- 10 final consonants
-- 
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