Editing Isan language (section)

====Vowel length====
Vowels usually exist in long-short pairs determined by [[vowel length]] which is [[phoneme|phonemic]], but vowel length is not indicated in the RTGS romanization commonly used in Thailand or the BGN/PCGN French-based scheme commonly used in Laos. The Isan word romanized as ''khao'' can represent both {{langx|tts|เขา}} {{IPA|/kʰǎw/}}, 'he' or 'she', and {{langx|tts|ขาว}} {{IPA|/kʰǎːw/}}, 'white' which corresponds to {{langx|lo|ເຂົາ}} and {{langx|lo|ຂາວ}}, respectively, which are also romanized as ''khao''. In these cases, the pairs of words have the same tone and pronunciation and are differentiated solely by vowel length.

{| class="wikitable" 
|+ Isan Long-Short Vowel Pairs (Thai Script/Lao Pronunciation)
! colspan="4" | Long vowels
! colspan="4" | Short vowels
|-
| Thai
| IPA
| Lao
| IPA
| Thai
| IPA
| Lao
| IPA
|-
| colspan="4";|
| ◌ำ
| /am/
| ◌ຳ
| /am/
|-
| ◌า
| /aː/
| ◌າ
| /aː/
| ◌ะ, ◌ั, *{{ref|assumed|1}} 
| /aʔ/, /a/
| ◌ະ, ◌ັ
| /aʔ/, /a/
|-
| ◌ี
| /iː/
| ◌ີ 
| /iː/
| ◌ิ
| /i/
| ◌ິ 
| /i/
|-
| ◌ู
| /uː/
| ◌ູ
| /uː/
| ◌ุ
| /u/
| ◌ຸ
| /u/
|-
| เ◌
| /eː/
| ເ◌
| /eː/
| เ◌ะ, เ◌็
| /eʔ/, /e/
| ເ◌ະ, ເ◌ົ 
| /eʔ/, /e/
|-
| แ◌
| /ɛː/
| ແ◌
| /ɛː/
| แ◌ะ, แ◌็
| /ɛʔ/, /ɛ/
| ແ◌ະ, ແ◌ົ 
| /ɛʔ/, /ɛ/
|-
| ◌ื, ◌ือ 
| /ɯː/
| ◌ື 
| /ɯː/
| ◌ื
| /ɯ/
| ◌ຶ
| /ɯ/
|-
| เ◌อ, เ◌ิ 
| /ɤː/
| ເີ◌ 
| /ɤː/
| เ◌อะ
| /ɤʔ/
| ເິ◌ 
| /ɤʔ/
|-
| โ◌
| /oː/
| ໂ◌
| /oː/
| โ◌ะ, *{{ref|asssumed|2}}
| /oʔ/, /o/
| ໂ◌ະ, ◌ົ 
| /oʔ/, /o/
|-
| ◌อ
| /ɔː/
| ◌ອ◌, ◌ໍ
| /ɔː/
| เ◌าะ
| /ɔʔ/
| ເ◌າະ
| /ɔʔ/
|}
*{{note|assumed|1}} Unwritten in open syllables.
*{{note|asssumed|2}} Unwritten in closed syllables.