to do - Suru - する

The verb suruする” (to do) is one of the two important irregular verbs in Japanese language. The conjugation of this verb is quite simple and easy to learn because the verb does not follow the general rules as other Japanese verbs.

There are several different verbs which are formed as a combination between a noun and the verb suru. As an example, we can mention the verb Kaiketsu suru (解決する) that means “"to resolve a problem". In addition, Suru as a verb has other interesting combinations, formed with the ending “jiru”. For example the verb ronjiru (論じる) that means “to debate”.

The correct conjugations of the verb suru are as follows:

Conjugation of Japanese verb Suru - to do する
Form Kanji Romaji
Informal Present する Suru
Formal Present
(~ masu Form)
します Shimasu
Informal Past 
(~ ta Form)
した Shita
Formal Past  しました Shimashita
Informal Negative
(~ nai Form)
しない Shinai
Formal Negative しません Shimasen
Informal Past Negative しなかった Shinakatta
Formal Past Negative しませんでした shimasen deshita
Conditional すれば Sureba
Volitional しよう Shiyou
Passive される Sareru
Causative させる Saseru
Potential できる Dekiru
Imperative (Command) しろ Shiro

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