Editing Japanese grammar (section)

====Colloquial contractions====
In speech, common combinations of conjugation and auxiliary verbs are contracted in a fairly regular manner.

{| class=wikitable
|+ Colloquial contractions
|-
! Full form || Colloquial !! Example
|-
| {{nihongo||〜てしまう|-te shimau}}
| {{nihongo||〜ちゃう/-ちまう|-chau/-chimau}}{{pb}}group 1
| {{fs interlinear|lang=ja
 | 負け'''て''' '''しまう''' → 負け'''ちゃう''' / 負け'''ちまう'''
 | make'''te''' '''shimau''' {} make'''chau''' / make'''chimau'''
 | 'lose'}}
|-
| {{nihongo||〜でしまう|-de shimau}}
| {{nihongo||〜じゃう/〜じまう|-jau/-jimau}}{{pb}}group 1
| {{fs interlinear|lang=ja
 | 死ん'''で''' '''しまう''' → 死ん'''じゃう''' / 死ん'''じまう'''
 | shin'''de''' '''shimau''' {} shin'''jau''' / shin'''jimau'''
 | 'die'}}
|-
| {{nihongo||〜ては|-te wa}}
| {{nihongo||〜ちゃ|-cha}}
| {{fs interlinear|lang=ja
 | 食べ'''て''' '''は''' いけない → 食べ'''ちゃ''' いけない
 | tabe'''te''' '''wa''' ikenai {} tabe'''cha''' ikenai
 | 'must not eat'}}
|-
| {{nihongo||〜では|-de wa}}
| {{nihongo||〜じゃ|-ja}}
| {{fs interlinear|lang=ja
 | 飲ん'''で''' '''は''' いけない → 飲ん'''じゃ''' いけない
 | non'''de''' '''wa''' ikenai {} non'''ja''' ikenai
 | 'must not drink'}}
|-
| {{nihongo||〜ている|-te iru}}
| {{nihongo||〜てる|-teru}}{{pb}}group 2b
| {{fs interlinear|lang=ja
 | 寝'''て''' '''いる''' → 寝'''てる'''
 | ne'''te''' '''iru''' {} ne'''teru'''
 | 'is sleeping'}}
|-
| {{nihongo||〜ておく|-te oku}}
| {{nihongo||〜とく|-toku}}{{pb}}group 1
| {{fs interlinear|lang=ja
 | し'''て''' '''おく''' → し'''とく'''
 | shi'''te''' '''oku''' {} shi'''toku'''
 | 'will do it so'}}
|-
| {{nihongo||〜て行く|-te iku}}
| {{nihongo||〜てく|-teku}}{{pb}}group 1
| {{fs interlinear|lang=ja
 | 出'''て''' '''行け''' → 出'''てけ'''
 | de'''te''' '''ike''' {} de'''teke'''
 | 'get out!'}}
|-
| {{nihongo||〜てあげる|-te ageru}}
| {{nihongo||〜たげる|-tageru}}{{pb}}group 2a
| {{fs interlinear|lang=ja
 | 買っ'''て''' '''あげる''' → 買っ'''たげる'''
 | kat'''te''' '''ageru''' {} kat'''tageru'''
 | 'buy something (for someone)'}}
|-
| {{nihongo||〜るの|-ru no}}
| {{nihongo||〜んの|-nno}}
| {{fs interlinear|lang=ja
 | 何 して い'''る''' '''の''' → 何 して'''んの'''
 | nani shite i'''ru''' '''no''' {} nani shite'''nno'''
 | 'what are you doing?'}}
|-
| {{nihongo||〜りなさい|-rinasai}}
| {{nihongo||〜んなさい|-nnasai}}
| {{fs interlinear|lang=ja
 | や'''りなさい''' → や'''んなさい'''
 | ya'''rinasai''' {} ya'''nnasai'''
 | 'do it!'}}
|-
| {{nihongo||〜るな|-runa}}
| {{nihongo||〜んな|-nna}}
| {{fs interlinear|lang=ja
 | や'''るな''' → や'''んな'''
 | ya'''runa''' {} ya'''nna'''
 | 'don't do it!'}}
|-
| {{nihongo||〜れは or 〜れば|-re wa or -reba}}
| {{nihongo||〜りゃ|-rya}}
| {{fs interlinear|lang=ja
 | どう す'''れば''' いい の だろう → どう す'''りゃ'''(あ） いいん だろう
 | dou su'''reba''' ii no darou {} dou su'''rya''' iin darou
 | 'what should I do?'}}
|}

There are occasional others, such as {{transliteration|ja|-aranai}} → {{transliteration|ja|-annai}} as in {{Nihongo3|don't understand|分からない|wakaranai}} → {{Nihongo3||分かんない|wakannai}} and {{Nihongo3|boring|つまらない|tsumaranai}} → {{Nihongo3||つまんない|tsumannai}} – these are considered quite casual and are more common among the younger generation.{{Citation needed|date=November 2021}}

Contractions differ by dialect, but behave similarly to the standard ones given above. For example, in the [[Kansai dialect]], {{Nihongo3||〜てしまう|-te shimau}} → {{Nihongo3||〜てまう|-temau}}.