N4 — outside your level filter
Modifies the end of the sentence directly and takes no だ／です, so there are no forms to conjugate.
長い間
nagaiaidalong timeN4adverb
Example sentences2
長い間、彼に会っていません。
nagai aida, kare ni atte imasen.
I haven't seen him for a long time. neutral
長い間待たせてごめんね。
nagai aida matasete gomen ne.
Sorry for keeping you waiting so long. casual