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知らされる means "to be informed".

知らせる means "to inform"

Why is 知らせされる not used? I almost always hear/see 知らされる。Is it a different verb
entirely?
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2017-03-09T05:51:21.187
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2017-03-09T18:27:43.213
2017-03-09T07:16:41.193
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question
grammar verbs conjugations causation
知らせる・知らされる conjugation
There is also a verb 知らす "to inform/notify" and 知らされる is the passive of this
verb.

As explained in @l'électeur's answer to the question [Causative せる/させる vs.
す/さす](https://japanese.stackexchange.com/q/43474/1628), 知らす is an older form
(文語体) of 知らせる (口語体) with the same meaning. (Most if not all causative forms
～せる can be thought of having derived from an older ～す verb.)

* * *

You also ask about *知らせ **され** る, which is not a correct form. The causative
of 知らせる is 知らせ **させ** る. The passive is 知らせ **られ** る.

### Causative 知らせさせる

知らせる (and 知らす) are already the causative form of 知る, even if they are used
more idiomatically as "to inform", rather than the literal "to make [someone]
know".

In any case, the causative of 知らせる, which would be 知らせさせる, could in principle
be used, e.g.

> 知らせさせてください  
>  Please allow me to inform [someone else]

However, such cases are probably quite rare.

### Passive 知らせられる vs 知らされる

As you seem to have noticed, 知らせられる and 知らされる are passives of two different
but related verbs that mean the same thing.

I think 知らされる can be thought of as the _de facto_ passive of 知らせる. 知らせられる
appears not to be used. (At least not as a passive; of course, the potential
is of the same form.)

Something similar seems to happen with other verbs. For example, やる has a
causative やらせる and _de facto_ passive やらされる. The passive やらせられる is hardly ever
used.
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answer