koukaisuru

Usages of koukaisuru

留守るす の とき に た 宅配便たくはいびん の 不在票ふざいひょう を て、 「る 時間じかん を メモして おけば よかった」 と すこし 後悔こうかいしました。rusu no toki ni kita takuhaibin no huzaihyou wo mite, 「uketoru zikan wo memosite okeba yokatta」 to sukosi koukaisimasita.
Seeing the missed-delivery slip that came while I was away, I regretted a little, thinking, “I should have written down the time I could receive it.”
昨日きのう は ケーキ を ふたつ べたこと を すこし 後悔こうかいして います。kinou ha keeki wo hutatu tabetakoto wo sukosi koukaisite imasu.
I somewhat regret having eaten two pieces of cake yesterday.

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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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