Usages of kosi
重い 荷物 を 持った あと、 腰 が 痛く なりました。omoi nimotu wo motta ato, kosi ga itaku narimasita.
After carrying heavy luggage, my lower back started to hurt.
長い 時間 スマホ を 見る たび に、 首 や 腰 が 疲れます。nagai zikan sumaho wo miru tabi ni, kubi ya kosi ga tukaremasu.
Every time I look at my smartphone for a long time, my neck and lower back get tired.
腰 が 痛い ので、 今夜 は 湿布 を 貼って 寝ます。kosi ga itai node, konya ha sippu wo hatte nemasu.
Because my lower back hurts, I will put on a pain-relief patch and go to bed tonight.
腰 が 少し 痛い ので、 寝る 前 に 湿布 を 貼ります。kosi ga sukosi itai node, neru mae ni sippu wo harimasu.
Because my lower back hurts a little, I put on a patch before going to bed.
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“How do verb conjugations work in Japanese?”
Japanese verbs conjugate based on tense, politeness, and mood. For example, the polite present form adds ‑ます to the verb stem, while the past tense uses ‑ました. Unlike English, Japanese verbs don't change based on the subject — the same form works for "I", "you", and "they".
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