予期せぬ事態が発生した

N3 予期 yoki expectation, forecast, anticipation N4 事 koto thing, matter, fact, event N1 発生 hassei outbreak, spring forth, occurrence

N3 予 yo, sha / arakaji.me beforehand, previous, myself N3 期 ki, go period, time, date N4 事 ji, zu / koto, tsuka.u, tsuka.eru matter, thing, fact N1 態 tai / waza.to attitude, condition, figure N4 発 hatsu, hotsu / ta.tsu, aba.ku, oko.ru, tsuka.wasu, hana.tsu departure, discharge, publish N5 生 sei, shou / i.kiru, i.kasu, i.keru, u.mareru, uma.reru, u.mare, umare, u.mu, o.u, ha.eru, ha.yasu, ki, nama, nama-, na.ru, na.su, mu.su, -u life, genuine, birth

N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences