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Suru is one of the only two irregular Japanese verbs. It can be combined with verbs of chinese origin and other loan words to form compound verbs.
Verb ClassIrregular
Stemsu -
This is for a guide only. Please double-check if you need to use the information for something important. I've done my best to get everything right but like any self respecting software there may be bugs in it! .
Present Indicative Plain souji suru
souji shinai
Polite souji shimasu
souji shimasen
Past Indicative Plain souji shita
souji shinakatta
Polite souji shimashita
souji shimasen deshita
Presumptive Plain souji shiyō
souji suru darō
souji shinai darō
Polite souji shimashō
souji suru deshō
souji shinai deshō
Past Presumptive Plain souji shitarō
souji shita darō
souji shinakatta darō
Polite souji shimashitarō
souji shinakatta deshō
Present Progressive Plain
Polite souji shite imasu
souji shite imasen
Past Progressive Plain
Polite souji shite imashita
souji shite imasen deshita
Provisional Plain souji sureba
souji shinakereba
Polite souji shimaseba
souji shimasureba
souji shimasen nara
Conditional Plain souji shitara
souji shinakattara
Polite souji shimashitara
souji shimasen deshitara
Potential Plain souji dekiru
souji dekinai
Polite souji dekimasu
souji dekimasen
Causative Plain souji saseru
Imperative Plain souji shiro
souji suruna
Polite souji shite kudasai
souji shinaide kudasai
Passive Plainsareru