Japanese Verb Rules - Conditional Form

~たら Conditional Form

This verb form expresses a condition for the main clause.

How to derive the Conditional form:

Group 1: Change the final る toたら
Group 2: When the final syllable is

く, change it to いたら
ぐ, change it to いだら
す, change it to したら
む, ぬ, or ぶ, change it to んだら
つ, る, or う, change it to ったら
Exception: いく (to go) →いったら
Group 3: くる→きたら、する→したら

How to use the form:

This form indicates a condition of the main clause. The main clause expresses an unexpected event when the verb in the main clause is in the perfective aspect.

うち		かえ		はは
家	に	帰	ったら、	母	がいました。

'When I went home, to my surprise, my mother was there.'

When the verb in the main clause is in the imperfective aspect, the conditional clause expresses a condition upon which the speaker will decide to engage in the action described in the main clause.

じ	かん		えい	が		い
時	間	があったら、	映	画	に	行	きます。

'If I have time, I will go to a movie.'