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