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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 shitsumon suru
shitsumon shinai
Polite shitsumon shimasu
shitsumon shimasen
Past Indicative Plain shitsumon shita
shitsumon shinakatta
Polite shitsumon shimashita
shitsumon shimasen deshita
Presumptive Plain shitsumon shiyō
shitsumon suru darō
shitsumon shinai darō
Polite shitsumon shimashō
shitsumon suru deshō
shitsumon shinai deshō
Past Presumptive Plain shitsumon shitarō
shitsumon shita darō
shitsumon shinakatta darō
Polite shitsumon shimashitarō
shitsumon shinakatta deshō
Present Progressive Plain
Polite shitsumon shite imasu
shitsumon shite imasen
Past Progressive Plain
Polite shitsumon shite imashita
shitsumon shite imasen deshita
Provisional Plain shitsumon sureba
shitsumon shinakereba
Polite shitsumon shimaseba
shitsumon shimasureba
shitsumon shimasen nara
Conditional Plain shitsumon shitara
shitsumon shinakattara
Polite shitsumon shimashitara
shitsumon shimasen deshitara
Potential Plain shitsumon dekiru
shitsumon dekinai
Polite shitsumon dekimasu
shitsumon dekimasen
Causative Plain shitsumon saseru
Imperative Plain shitsumon shiro
shitsumon suruna
Polite shitsumon shite kudasai
shitsumon shinaide kudasai
Passive Plainsareru