Verbs
There are two types of verbs: u-verbs and ru-verbs. U-verbs can be broken down into the base of the verb, and then the suffix "u." Ru-verbs can be broken down into the base, and the suffix "ru." Verbs conjugate for tense (present, past, etc.) in Japanese.
Present/Future Tense
U-Verb Conjugation
Let's work with the verb きく (to listen). きく is the dictionary or infinitive form, which means that it has not been conjugated. The base of the verb is "kik." To change the verb to the present, affirmative form, remove the suffix "u," leaving the base "kik." Then add "imasu" to the base, which gives us ききます (kikimasu). To change the verb to the present, negative tense, add "imasen" to the base: ききません (kikimasen). All regular u-verb conjugation works in the same manner, removing the suffix "u" and replacing it with the proper suffix to indicate your desired tense.
| affirmative | negative |
| base + います(ききます) | base + いません(ききません) |
Ru-Verb Conjugation
Ru-verb conjugation is a bit easier than u-verb conjugation. You simply remove the "ru" suffix to get the base and add either "masu" for the affirmative form, or "masen" for the negative. So the verb たべる (to eat) becomes たべます (I eat) and たべません (I don't eat).
| affirmative | negative |
| base + ます(たべます) | base + ません (たべません) |
Past Tense
U-Verb Conjugation
いました (imashita) is added to the base for the affirmative form, and いませんでした (imasendeshita) is added to the base for the negative form.
| affirmative | negative |
| base + いました(ききました) | base+ いませんでした |
Ru-Verb Conjugation
ました (mashita) is added to the base for
the affirmative form, and ませんでした (masendeshita) is added
to the base for the negative form.
| affirmative | negative |
| base + ました(たべました) | base + ませんでした (たべませんでした) |
Irregular Verbs
I will go over the conjugations for two irregular verbs here.
する (to do)
| affirmative | negative | |
| present | します | しません |
| past | しました | しませんでした |
くる (to come)
| affirmative | negative | |
| present | きます | きません |
| past | きました | きませんでした |
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