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