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

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