Is the 仮定形 used only to make the conditional? toru --aEiou--> tore --joshi--> toreba. Is the ba-joshi the only suffix that can be added to the kateikei form of the verb?

In modern Japanese, is used almost exclusively to make a conditional. The definition in a Japanese dictionary suggests that is alway followed by “”.

One apparent exception is “” but this is + “”. is used in classical Japanese and means that something has been done. is an ancestor of but their meaning is different.