こそit is ... that ..., precisely, in particular, definitely, for sure, only (when, after, because, etc.), , although, while, it is the case that ... but, it is precisely because ... that ..., only because ..., not at all, not in the slightest, absolutely not, never

Common

1. Particle

   1. 1.

      it is ... that ..., precisely, in particular, definitely, for sure, only (when, after, because, etc.)

      emphasizes preceding word or phrase

   2. 2.

      although, while, it is the case that ... but

      as こそあれ, こそすれ, こそするが, etc.

   3. 3.

      it is precisely because ... that ..., only because ...

      after conditional -ba form of verb

   4. 4.

      not at all, not in the slightest, absolutely not, never

      Formal or literary term, after -nai stem of verb + ば