う-Verb (Past)

To make the past form of a う-Verb in Japanese, just like all other conjugations of う-Verbs, you will need to change the last kana, before adding the auxiliary verb た (casual), or ました (polite). This change in kana is a bit different to other conjugations of う-Verbs, so let's take a look at them for the casual form.

As can be seen in these examples, the changes consist of った, いた, いだ, んだ, した (the same as the changes for て form, but using た instead). For the conjugations using だ in place of た, this is simply a sound change in the language that happened over the course of history, to make words easier/smoother to say. It is not the auxiliary verb だ.

For the polite past form of う-Verbs, the change in sound is far more consistent. This only requires a change from the う sound, to the い sound within the same column (from う to い, or from く to き, for example).

When た is added to verbs (or any other word), it can have one of three possible meanings.

Past: 過去(かこ) - Happened at some point in the past. (Did/Was)

Completion: 完了(かんりょう) - An action that has finished 'happening'. (Done)

Continuation: 存続(そんぞく) - A new state of something that is continuing. (Has been done)

Caution

With う-Verbs, there are a few verbs that are exceptions to the regular conjugation rules. Please check the structure guide for these.