今日は早く寝ることにします。

N5 今日 kyou today N5 早く hayaku early / quickly N5 寝る neru to sleep; to go to sleep; to go to bed

N5 今 kon, kin / ima now, maintenant, ahora N5 日 nichi, jitsu / hi, -bi, -ka day, sun, Japan N4 早 sou, satsu / haya.i, haya, haya-, haya.maru, haya.meru, sa- early, fast, tôt N3 寝 shin / ne.ru, ne.kasu, i.nu, mitamaya, ya.meru lie down, sleep, rest

N4 〜ことにする koto ni suru Indicates a voluntary decision made by the speaker or group, attaches to a verb, means decide to do N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information