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