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