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