Causative form せる・させる in Japanese

Using the auxiliary verbs せる seru and させる saseru we form the causative form in Japanese.

The causative form, as the name suggests, is used to express something we do or allow someone to do.

The causative form indicates something that causes or allows something else.

In English to express the causative form, verbs such as permit or allow are used. In Japanese, on the other hand, this form is expressed with verbal conjugations, using the verbs せる seru and させる saseru.

This form is similar to English when we use the term make do. In fact, I make him do can mean:

• Obligation: I force him to take an action
• Permission: I allow him to take an action

In the causative form the same is true in the Japanese language.

How to conjugate the Causative Form in Japanese

The causative form is simple to conjugate in Japanese. We must make a distinction between Ichidan verbs, Godan verbs, and irregular verbs.

Causative form for Ichidan verbs

To conjugate the causative form of Ichidan verbs just change the last Hiragana ~る with ~させる.

Remember that all verbs in the Ichidan category end with the symbol Hiragana る

Causative form for Godan verbs

To conjugate the causative form of Godan verbs we have to modify the last Hiragana in the Base B1 (Negative) and add ~せる.

In this example we see how the verb 飲(の)む (drink) is conjugated in its Base B1 by removing む mu and adding ま ma, that is the Hiragana symbol that is part of the same series as む mu (both start with the character m) but ending in a: ま ma.

Contracted forms of させる and せる

Please note that in their contracted-form the verbs ～させる and ～せる become ～さす and ～す respectively:

The copula だ (da) is not used alone in the causative form, but is instead replaced by the form ～にさせる

Causative form for irregular verbs

The two irregular verbs する and くる have a particular conjugation for the causative form:

Causative form with transitive verbs

Now let's see how to use the particles with the causative form to indicate the various elements of the sentence (subject, object, etc.).

• With transitive verbs the one who is forced to perform the action is with the particle に (ni)
• The object of the sentence, if present, is always indicated with the particle を (wo)
• The subject, the one who forces to perform the action, is indicated with the particle が (ga)

Let's see an example of a sentence with the causative form compared to a normal sentence:

In the example sentence, the subject student 生(せい)徒(と) is expressed with the particle が and the object essay 作(さく)文(ぶん) with the particle を. In this case, the subject performs the action, and the object indicates what is being done.

Instead, let's see the same sentence in the causative form:

In this sentence we note the use of the causative form from the conjugation of the verb 書(か)く write which becomes 書(か)かせる:

• The subject, that is the one who causes the action, is the teacher 先(せん)生(せい), indicated with the particle が
• The students 生(せい)徒(と), who are forced to write, are denoted by the particle に
• The object the essay 作(さく)文(ぶん), what is written, is indicated by the particle を

Causative form with intransitive verbs

With intransitive verbs the one who is forced to perform the action can be indicated with the particle に or を. The choice between one particle and the other is dictated by some rules.

In general these two particles can be used both in the same situation:

However, there are some situations in which the に particle or the を particle must be used.

When to use を with intransitive verbs in the causative form

We use を in the causative form for intransitive verbs in the following situations:

• When we are not talking about a person, that is when the direct object cannot act voluntarily (in the example below the tomatoes トマト)

• When we cause an emotion

When to use に with intransitive verbs in the causative form

We use に in the causative form for intransitive verbs in the following situations:

• When a movement verb uses the particle を (歩(ある)く walk in the example below)

The causative form is closely related to passive form. The advice is therefore to learn the passive form.

Causative form and Keigo

A very common use in the Japanese language of the causative form is in the Keigo, the honorific language.

The structure consists of:

• the causative form in て: せて / させて +
• the verb いただく or もらう, the verbs of giving and receiving in Japanese.

Here is a short dialogue for this function:

I translated the causative phrase simply as thank you; it actually means "thank you for allowing me to use the bathroom ".

• Comment to a YouTube Video on Japanese culture in which the causative form with Keigo function is used for the verb 気(き)付(づ)く to realise.