The mizenkei + せる (seru) and the mizenkei + させる (saseru) are used to create the causative form. The causative form is translated as "let, have, or make somebody do". This causative form cannot be combined with verbal adjectives.

The mizenkei + せる (seru) is used with group 4 (or yodan katsuyou) verbs and the mizenkei + させる (saseru) is used with group 2 (or nidan katsuyou) verbs.

Irregular verbs
The causative form of 来る (kuru) is formed by placing させる (saseru) after the mizenkei. The causative form of する (suru) is formed by placing せる (seru) after さ (sa).

Rentaikei		Mizenkei + (さ)せる ((sa)seru)
買う	kau	買わせる	kawaseru
書く	kaku	書かせる	kakaseru
出す	dasu	出させる	dasaseru
待つ	matsu	待たせる	mataseru
食べる	taberu	食べさせる	tabesaseru
見る	miru	見させる	misaseru
する	suru	させる	saseru
来る	kuru	来させる	kosaseru

When adding (さ)せる ((sa)seru), a group 2 verb, to the mizenkei the resulting verb is also conjugated as group 2 verbs. For the correct conjugations please check the conjugations page.

The Causative form
The causative form is used to describe that "A" makes "B" do "C". "A", is then followed by the particle に (ni), "B", who performs the actual action, is followed by the subject particle が (ga), and "C" is followed by the object particle を (wo). "B"が"A"に"C"をさせる。 ("B" ga "A" ni "C" wo saseru.)

Mizenkei + (さ)せられる ((sa)serareru)
The mizenkei + させる (saseru) can also be combined with the passive form られる (rareru). This combination can have two functions:

- Being forced to do something
- Ultra humble form (used when speaking to the emperor or to gods)

For more information check the causative forms page.

Related pages:
Mizenkei + られる (rareru)
Causative forms
Imperative forms
Polite forms
Passive forms