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