とまる / とめる and such pairs of verbs

Question

I'm a beginner in Japanese. At my classes I'm taught like this: とまる / とめる is a pair intransitive/transitive verb.

This I understand and can memorize a table of such verbs.

I can't help, though, notice a certain phonetic change pattern in all those pairs. To this pattern in my classes I was given no explanation.

I wonder if there is any theoretical grammar explanation of that pattern for those Japanese verbs. Unfortunately, I'm not aware of any good Japanese theoretical grammar textbook.

(In my native language and in some other languages I know transitive/intransitive is a lexical, not grammatical category, so I wonder, if that transitive/intransitivre explanation for Japanese is correct at all)

Answer 1

Historically, Japanese has had several morphemes that change the transitivity of a verb. Most of these pairs involved lexicalised combinations of some verb with one of these morphemes.

The morphemes are:

-(a)su - causative. You can see it in words like ゆらす ('cause to shake', compare ゆれる 'shake').

-(a)ru - passive, or rather, general agent deletion (English's passive implies an agent, this doesn't). Visible in your example とまる ('come to a stop on one's own', compare とめる 'cause something else to stop').

-e(ru) - a kind of transitivity flipper, it can make transitives intransitive or intransitives transitive. An example of the first is さける ('split open', compare さく 'tear'), and an example of the second is つける ('attach', compare つく 'stick to').

Many of these pairs, とめる~とまる included, seem to have had these morphemes added to both members.

I'm not sure this is a grammatical process, at least any more; none of these morphemes are still productive as far as I know. You're probably best off remembering each word as a single lexical unit, especially considering the fact that there's a good deal of variation among what pairs up with what. Just remembering that あげる is 'raise' and あがる is 'rise' prevents you from trying to make non-words like *あがす or *あぐ.

(The Middle Japanese -(a)su and -(a)ru were nidan verbs, and became the ichidan -(a)seru and -(a)reru, which are still extremely productive in Modern Japanese. I don't have an explanation for why verb forms that incorporate them are godan.)

Answer 2

(My answer partly builds off of Siveru's answer.)

The Dictionary of Basic Japanese Grammar (DBJG) gives an appendix (number 3) of intransitive/transitive patterns which probably includes all the pairs you have been given plus a few more. When I first began to study I was able to learn the pairs in my text book but found the appendix a bit too much. Looking at that list now I would say that I picked up almost all those pairs "organically" have not regretted taking that approach because there are other more important things to memorize.

However (Updated in response to comments ):

There were a couple of "verb-families" in the　-eru (Intransitive)-> u(Transitive)section which I still found sticky because they seem more like triplets or "pairs of pairs" and I sometimes had to double check if I had not used them for a while! These included:

破れるー＞破る　(splitting/separating things like broken hearts and making holes)
破けるー＞破く (tearing thin things)

An example of a "triplet", not in the appendix is

つかむ／つかまる／つかまえる

For these I try to remember:

ロープをつかむ　｜　grab a rope

Aが〜につかまる　｜hang on to a rope

魚を捕まえる　｜catch a fish

〜が捕まる　｜be caught

Needless to say I do looking for patterns and today, Silverju's morphemes resolved this triplet for me:

a(ru); つかむ->つまる and the flipper e(ru); つかまるー＞つかまえる

The same also applies to my other hated triplet

つなく／つながる／つなげる.

This is how I currently remember it:

PCを インタネットにつなぐ (= アクセスする)

犬を門につないでおく =つなげる

ie:

自＝ 〜がつながる （＝＞〜がつながっている）
他＝ 〜をつなぐ＝つなげる

But, applying the morphemes given above:

-(a)ru:つなぐ ー＞ つながる; and the flipper-e(ru)ー＞つなげる

ie Transitive -> intransitive - > Transitive

(Thanks Silveru.)