N4 — outside your level filter
数+冊
Needs a numeral in front of it and takes no だ/です, so there are no forms to conjugate.
冊
satsucounter for booksN4counter
Example sentences2
この本を二冊ください。
kono hon o nisatsu kudasai.
Please give me two of these books. neutral
その雑誌、一冊でいいよ。
sono zasshi, issatsu de ii yo.
One copy of that magazine's fine. casual