Usages of kouka
この 薬 に は 効果 が ある。kono kusuri ni ha kouka ga aru.
This medicine has an effect.
運動 の 効果 を 調べた。undou no kouka wo sirabeta.
I examined the effect of exercise.
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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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