What are the valid potential forms of special "suru" verbs?


Good afternoon all,

From what I understand, special "suru" verbs only have one potential form
which is formed using the syntax:

[code]

    [verb-stem] + [せる]
    
[/code]

For example, 愛す・愛する → 愛せる and 訳す・訳する → 訳せる.

However, [A Dictionary of Advanced Japanese
Grammar](http://rads.stackoverflow.com/amzn/click/B001GOVW4M) claims that "熱する
(ねっする)" and "察する (さっする)" conjugates in the same way as "する". Snippet:

![enter image description here](https://i.stack.imgur.com/cbLKF.png)

By that claim, it seems to mean that the potential form of "熱する" would be
"熱できる (uh, ねっできる?)" and the potential form of "訳する" would be "訳できる".

WWWJDIC also has a chart which shows that the potential form of "訳する" is
"訳しえる" and/or "訳しうる" ([link](http://goo.gl/NeYpP)).

So now we have these potential forms:

  1. `[verb-stem] + [せる]` (e.g. 愛せる, 訳せる, 熱せる, 察せる)

  2. `[verb-stem] + [しえる]` (e.g. 愛しえる, 訳しえる, 熱しえる, 察しえる)

  3. `[verb-stem] + [しうる]` (e.g. 愛しうる, 訳しうる, 熱しうる, 察しうる)

  4. `[verb-stem] + [できる]` (e.g. 愛できる, 訳できる, 熱できる, 察できる)

Are all of these 4 conjugations grammatically valid potential forms of special
"suru" verbs?




As @fefe mentions, the 4th one is wrong for the examples you mention. I think
your grammar book forgot about the potential.

I don't know the detailed etymology, but I guess somehow 愛する, 訳する, 熱する, 察する
are more like "proper verbs" (although they inherit most of the irregularities
of する), whereas 勉強する etc. are still more like a compound: noun+する, thereby
inheriting also the suppleted potential of する, できる.




As @fefe mentions, the 4th one is wrong for the examples you mention. I think
your grammar book forgot about the potential.

I don't know the detailed etymology, but I guess somehow 愛する, 訳する, 熱する, 察する
are more like "proper verbs" (although they inherit most of the irregularities
of する), whereas 勉強する etc. are still more like a compound: noun+する, thereby
inheriting also the suppleted potential of する, できる.

