N4 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ/です, so there are no forms to conjugate.
お疲れ様でした
otsukaresamadeshitathanks for your hard workN4expression
Example sentences2
今日も一日お疲れ様でした。
kyou mo ichinichi otsukaresama deshita.
Thanks for your hard work again today. neutral
皆様、お疲れ様でした。お先に失礼いたします。
minasama, otsukaresama deshita. osaki ni shitsurei itashimasu.
Everyone, thank you for your hard work — I'll be heading out first. formal