toru --aEiou--> tore --joshi--> toreba.
Is the ba-joshi the only suffix that can be added to the kateikei form of the verb?
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3No, as you seem to have discovered for yourself. – Zhen Lin Oct 14 '14 at 18:18
In modern Japanese, 仮定形 is used almost exclusively to make a conditional. The definition in a Japanese dictionary 大辞林 suggests that 仮定形 is alway followed by “ば”.
One apparent exception is “すれども” but this is 已然形 + “ども”. 已然形 is used in classical Japanese and means that something has been done. 已然形 is an ancestor of 仮定形 but their meaning is different.
