Did the られる potential form come from 得る?


One of the shows I've been watching lately kept using some more classical
forms of Japanese for style purposes, that I was not too familiar with ; this
led me to notice how 得る{える} was often used as an auxiliary verb. For example,
this makes constructions like 有り{あり}得ない{えない} way easier to remember now that I
can see the how it's built.

Looking more into it, it seems (explained in
[here](https://classicaljapanese.wordpress.com/2014/03/29/u/)) that it can
indeed be used to indicate potential as a somewhat old/formal form.

The modern potential form 〜られる/〜える looks very similar however (as alluded to
in
[here](https://japanese.stackexchange.com/questions/1865/%e5%be%97%e3%82%8b-vs-%ef%bd%9e%e3%82%89%e3%82%8c%e3%82%8b-potential-
form)), especially for godan verbs.

My hypothesis is that the modern 〜える (for godan verbs) directly comes from 得る,
and that 〜られる (for ichidan verbs) was initially some kind of alternate
construction (the only thing that comes to mind is a contraction of something
involving ある like 食べれ・あれ・得る → 食べられる).

Is there any definite proof of the connection between the two? What
transformations led to the construction of the modern form, if there is such a
connection?




According to [this
paper](https://www.google.com/url?sa=t&source=web&rct=j&url=http://ypir.lib.yamaguchi-u.ac.jp/sc/file/1683/20100303141623/SC20052000109.pdf&ved=2ahUKEwjj-
PiWudXrAhUDE6YKHWM8DWEQFjADegQIBRAB&usg=AOvVaw0vNzMxr3YK3TFWv-CLd58H), the
current Japanese 可能形 at least in part likely derives from the passive, due to,
as stated in the paper, the passive expressing:

> 主体の意志とは関係なく動作が実現してしまう（こと）  
>  An action realized without regard for the will of the subject

A cursory search on
[wikipedia](https://ja.m.wikipedia.org/wiki/%E8%87%AA%E7%99%BA_\(%E6%96%87%E6%B3%95\))
suggests that the passive る and らる endings (which developed into the current
れる and られる endings) derive not from 得る but 生【あ】る, with る attached to the 未然形
of verbs that undergo 四段活用, ナ変格活用, and ラ行変格活用 (e.g. 住む→住まる) to preserve the
original ある pronunciation of the suffix, and らる attached to the 未然形 of all
other verbs (e.g. 当つ→当てらる) as their 未然形 wouldn't end in a member of the ア段.
While this does not explain why ら was selected for らる, it does confirm that
the られる ending most likely does not have anything to do with 得る.

EDIT:

As an aside, the trend where old 二段動詞 became 一段動詞
(上ぐ→上げる、寝【ぬ】→寝る、生く→生きる/生ける、〜る→〜れる、〜らる→〜られる等) is loosely referred to as
二段動詞の一段化 (you can read a bit about it
[here](https://core.ac.uk/download/pdf/56628759.pdf) and
[here](https://core.ac.uk/download/pdf/147575276.pdf)), and has absolutely
nothing to do with 得る.




To expand on [sbkgs4686's](https://japanese.stackexchange.com/users/35632/)
answer, I'd like to go a bit further into the history of the modern passive
ending ～られる, and of the modern verb of potential, 得る【える】.

## The history of ～られる

Let's start by looking at the modern passive ending ～られる and how this has
developed through the years.

### Monograde form

The modern passive ending ～られる has a regular 下一段【しもいちだん】 conjugation pattern
-- 下【しも】 or "lower" since the stem ends in //-e// (a "lower" vowel value than
the other vowel-stem ending //-i//), and 一段【いちだん】 or "one step; monograde"
since the verb stem only has the one vowel for all endings.

### Older bigrade form

Just like all 下一段【しもいちだん】 verbs, this comes from the older 下二段【しもいちだん】 or
"lower bigrade" pattern -- 二段【にだん】 or "bigrade" since the verb stem ends in
either of two vowels depending on the conjugation form, //-e// or //-u//. So
modern ～られる used to have the 終止形【しゅうしけい】 ("terminal form", a.k.a. "dictionary
or plain form") of ～らる.

### The components: ら and る

As sbkgs4686 notes, the final ～る on the end is surmised to come from ある, the
old copula ("to be") verb of existence.

  * _Note: The copular verb had the terminal or dictionary form of あり for much of recorded history. The form ある was the 連体形【れんたいけい】 or "attributive form", for when the verb was used to modify a noun or noun phrase._

The linking ～ら～ is of uncertain derivation; this is only used to attach the
passive ending to verbs that themselves have the 一段【いちだん】 (or 二段【にだん】 in
Classical and Old Japanese) conjugation patterns.

  * Speculatively, I wonder if this linking element might not also be from this same ある, conjugated into the 未然形【みぜんけい】 or "irrealis / imperfective form" of [あ]ら～, as required for the passive ending, in order to explicitly add that linking //-a-// phoneme.

### Before る, there was ゆ

Before there was ～らる, there was ～らゆ. This is that linking ～ら～ plus ～ゆ, the Old
Japanese 助動詞【じょどうし】 or "auxiliary verb" (really, a suffix adding some kind of
[aspect](https://en.wikipedia.org/wiki/Grammatical_aspect) to the verb).

This ～ゆ ending had the 下二段【しもにだん】 conjugation pattern, which later
standardized into the 下一段【しもいちだん】 ending ～える. Note that this derives from
ancient _-yeru_ , with that _ye_ sound shifting to just _e_ through regular
historical sound change. This is the same ～える we find in modern verbs like
見える【みえる】 (from 見【み】 + ゆ), 聞こえる【きこえる】 (from 聞か【きか】 + sound shift + ゆ), 覚える
(from 思は【おもは】 + sound shift + ゆ), etc.

### The meaning

This ～ゆ indicates that the verb action happens spontaneously (without anyone
doing it), and this was also used to express passive and potential senses.

In a very similar fashion, the later ～る ending also indicates spontaneous
action, and passive and potential senses.

## The history of 得る【える】

Now let's look at the verb 得る【える】, commonly used in the modern language as a
compounding verb to express potential.

### Monograde form

Much like the modern passive ending ～られる, the modern verb 得る【える】 also has a
regular has a regular 下一段【しもいちだん】 conjugation pattern -- 下【しも】 or "lower"
since the stem ends in //-e// (a "lower" vowel value than the other vowel-stem
ending //-i//), and 一段【いちだん】 or "one step; monograde" since the verb stem only
has the one vowel for all endings.

### Older bigrade form

Just like all 下一段【しもいちだん】 verbs, this comes from the older 下二段【しもいちだん】 or
"lower bigrade" pattern -- 二段【にだん】 or "bigrade" since the verb stem ends in
either of two vowels depending on the conjugation form, //-e// or //-u//. So
modern 得る【える】 used to have the 終止形【しゅうしけい】 ("terminal form", a.k.a.
"dictionary or plain form") of 得【う】.

### The meaning

The potential sense of 得る【える】 is quite old, appearing already in the
[_Man'yōshū_](https://en.wikipedia.org/wiki/Man%27y%C5%8Dsh%C5%AB) poetry
collection, finalized in 759 (with some poems written possibly centuries
earlier).

That said, this verb also means "to get, to make something one's own".
Consider the very many meanings of the English verb _get_ , and how this is
also used in certain combinations to express both potential and passive
(potential: "I got it `[VERBed]`" [I was able to `[VERB]` it]; passive: "I got
`[VERBed]`" [I had `[VERB]` done to me]; and even the causative: "I got
someone to `[VERB]`" [I caused someone else to `[VERB]`]).

## Conclusion

To sum up:

  * Phonologically (in terms of the sounds), spontaneous / passive / potential ending ～[ら]ゆ and later ～[ら]る → ～[ら]れる do not match with potential / "to get" verb root う. 
    * There's that initial "Y" in ゆ that is absent in all attested forms of う / える.
    * There's that initial "R" in る → れる that is absent in all attested forms of う / える.
  * Semantically (in terms of meaning), spontaneous / passive / potential ending ～[ら]ゆ does not match with potential / "to get" verb root う. 
    * The oldest sense for ～[ら]ゆ expresses something that happens "on its own", while the oldest sense for う is "to get; to be possible".

Of the various components we have, and of the various historical forms we
have, any overlap between modern ～られる and modern 得る【える】 appears to be purely
accidental.

