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