Editing Khmer script (section)

===Modification by diacritics===
The addition of some of the [[#Diacritics|Khmer diacritics]] can modify the length and value of inherent or dependent vowels.

The following table shows combinations with the ''{{transliteration|km|nĭkkôhĕt}}'' and ''{{transliteration|km|reăhmŭkh}}'' diacritics, representing final {{IPA|[m]}} and {{IPA|[h]}}. They are shown with the a-series consonant {{lang|km|អ}} ''’â''.
{| class="wikitable" style="text-align: center"
! rowspan="2" | Combination
! colspan="2" | [[International Phonetic Alphabet|IPA]]
! colspan="2" | [[Romanization of Khmer#Geographic Department|GD]]
! colspan="2" | [[Romanization of Khmer#UNGEGN|UNGEGN]]
! rowspan="2" | [[Romanization of Khmer#ALA-LC Romanization Tables|ALA-LC]]
! rowspan="2" | Notes
|-
! a-series
! o-series
! a-series
! o-series
! a-series
! o-series
|-
| <big>{{lang|km|អុំ}}</big>
| {{IPA|[om]}}
| {{IPA|[um]}}
| ''om''
| ''um''
| ''{{transliteration|km|om}}''
| ''{{transliteration|km|ŭm}}''
| ''uṃ''
|
|-
| <big>{{lang|km|អំ}}</big>
| {{IPA|[ɑm]}}
| {{IPA|[um]}}
|''am''
|''um''
| ''{{transliteration|km|âm}}''
| ''{{transliteration|km|um}}''
| ''aṃ''
| style="text-align:left;" | The word {{lang|km|ធំ}} {{transliteration|km|thum}} ("big") is pronounced {{IPA|[tʰom]}} (but {{IPA|[tʰum]}} in some dialects).
|-
| <big>{{lang|km|អាំ}}</big>
| {{IPA|[am]}}
| {{IPA|[ŏəm]}}
|''am''
|''oam''
| ''{{transliteration|km|ăm}}''
| ''{{transliteration|km|ŏâm}}''
|''āṃ''
| style="text-align:left;" | When followed by {{lang|km|ង}} {{transliteration|km|ngô}}, becomes {{IPA|[aŋ]}}/{{IPA|[eəŋ]}} ''ăng/eăng''.
|-
| <big>{{lang|km|អះ}}</big>
| {{IPA|[ah]}}
| {{IPA|[ĕəh]}}
|''ah''
|''eah''
| ''{{transliteration|km|ăh}}''
| ''{{transliteration|km|eăh}}''
|''aḥ''
|
|-
| <big>{{lang|km|អិះ}}</big>
| {{IPA|[eh]}}
| {{IPA|[ih]}}
|''eh''
|''is''
| ''{{transliteration|km|ĕh}}''
| ''{{transliteration|km|ĭh}}''
|''iḥ''
|
|-
| <big>{{lang|km|អុះ}}</big>
| {{IPA|[oh]}}
| {{IPA|[uh]}}
|''oh''
|''uh''
| ''{{transliteration|km|ŏh}}''
| ''{{transliteration|km|ŭh}}''
|''uḥ''
|
|-
| <big>{{lang|km|អេះ}}</big>
| {{IPA|[eh]}}
| {{IPA|[ih]}}
| colspan="2" |''eh''
| colspan="2" | ''{{transliteration|km|éh}}''
|''eḥ''
|
|-
| <big>{{lang|km|អោះ}}</big>
| {{IPA|[ɑh]}}
| {{IPA|[ŭəh]}}
|''aoh''
|''uoh''
| ''{{transliteration|km|aôh}}''
| ''{{transliteration|km|ŏăh}}''
|''oaḥ''
| style="text-align:left;" | The word {{lang|km|នោះ}} {{transliteration|km|nŏăh}} ("that") can be pronounced {{IPA|[nuh]}}.
|}

The first four configurations listed here are treated as dependent vowels in their own right, and have names constructed in the same way as for the other dependent vowels (described in the previous section).

Other rarer configurations with the ''{{transliteration|km|reăhmŭkh}}'' are {{lang|km|អើះ}} (or {{lang|km|អឹះ}}), pronounced {{IPA|[əh]}}, and {{lang|km|អែះ}}, pronounced {{IPA|[eh]}}. The word {{lang|km|ចា៎ះ}} "yes" (used by women) is pronounced [caː] and rarely {{IPA|[caːh]}}.

The ''bânták'' (a small vertical line written over the final consonant of a syllable) has the following effects:
*in a syllable with inherent ''â'', the vowel is shortened to {{IPA|[ɑ]}}, UN transcription ''á''
*in a syllable with inherent ''ô'', the vowel is modified to {{IPA|[u]}} before a final [[labial consonant|labial]], otherwise usually to {{IPA|[ŏə]}}; UN transcription ''ó''
*in a syllable with the ''a'' dependent vowel symbol ([[File:Khmer a.png]]) in the a-series, the vowel is shortened to {{IPA|[a]}}, UN transcription ''ă''
*in a syllable with that vowel symbol in the o-series, the vowel is modified to {{IPA|[ŏə]}}, UN transcription ''oă'', or to {{IPA|[ĕə]}} ''eă'' before ''k'', ''ng'', ''h''

The ''{{transliteration|km|sanhyoŭk sannha}}'' is equivalent to the ''a'' dependent vowel with the ''{{transliteration|km|bântăk}}''. However, its o-series pronunciation becomes {{IPA|[ɨ]}} before final ''y'', and {{IPA|[ɔə]}} before final (silent) ''r''.

The ''yŭkôlpĭntŭ'' (pair of dots) represents {{IPA|[a]}} (a-series) or {{IPA|[ĕə]}} (o-series), followed by a glottal stop.