What is this いけ


太郎くんはお化けの話を聞いたあと、夜一人でトイレに **行け** なくなりました。

The problem in this sentence is the predicative. なくなりました should literally
translate into "became weeping". But I'm thoroughly clueless about this いけ
before that. I can't even say what form this shall represent.




泣く【なく】 (to weep) is not relevant.

> 太郎くんはトイレに行けなくなりました。  
>  Taro became unable to go to the toilet.

  * 行く: "to go"
  * 行ける: "to be able to go" ([potential form](http://www.guidetojapanese.org/learn/grammar/potential) of 行く)
  * 行けない: "not to be able to go", "to be unable to go" (negative potential form)
  * 行けなく: (continuative/adverbial form of 行けない, which connects to ～なる)
  * ～なる: "to become ～" (see [Using 「なる」 with i-adjectives](http://www.guidetojapanese.org/surunaru.html#part3))




泣く【なく】 (to weep) is not relevant.

> 太郎くんはトイレに行けなくなりました。  
>  Taro became unable to go to the toilet.

  * 行く: "to go"
  * 行ける: "to be able to go" ([potential form](http://www.guidetojapanese.org/learn/grammar/potential) of 行く)
  * 行けない: "not to be able to go", "to be unable to go" (negative potential form)
  * 行けなく: (continuative/adverbial form of 行けない, which connects to ～なる)
  * ～なる: "to become ～" (see [Using 「なる」 with i-adjectives](http://www.guidetojapanese.org/surunaru.html#part3))

