connective N1 rare written
〜いかんだ — depending on ~
〜いかんだ ・ いかんだ
A full written guide for 〜いかんだ is on the way.
This point is mapped in the grammar tree, but its examples, formation table and usage notes haven't been written yet. The fastest way to learn it now is to meet it in real sentences inside Jengo.
See 〜いかんだ in real sentences
Jengo shows 〜いかんだ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.