あの時、勉強しておけばよかったと後悔してる

N5 あの ano that, um N5 勉強 benkyou study, learning N3 後悔 koukai regret, remorse

N5 時 ji / toki, -doki time, hour, temps N4 勉 ben / tsuto.meru exertion, endeavour, encourage N4 強 kyou, gou / tsuyo.i, tsuyo.maru, tsuyo.meru, shi.iru, kowa.i strong, fort, fuerte N5 後 go, kou / nochi, ushi.ro, ushiro, ato, oku.reru behind, back, later N1 悔 kai / ku.iru, ku.yamu, kuya.shii repent, regret, regret

N5 〜ている te iru Indicates ongoing action, continuous state, repeated habit, or resulting condition depending on context N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N4 〜ば ba Indicates a hypothetical condition, attaches to verb or adjective, means if it happens then N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options N5 〜よ yo Sentence ending particle adding information to listener, emphasizes statement, expresses certainty or warning