ことにする

ことにする is a common Japanese expression used to indicate a personal decision or resolution to take an action. It conveys a sense of intentionality and often reflects a change in one’s plans or habits.

When using ことにする, it’s important to note that it expresses the speaker's own decision rather than an obligation or external requirement. It can be translated as "to decide to do [something]" or "to resolve to do [something]." This construction is often used in both spoken and written Japanese.

• Usage with verbs: You can attach ことにする to verbs in their dictionary form (e.g., 食べる[たべる] -> 食べることにする[たべることにする]).
• Usage with nouns: You can also use it with nouns (e.g., 学生[がくせい] -> 学生になることにする[がくせいになることにする]).

Overall, ことにする expresses a resolution towards future actions and indicates a volitional aspect in decision-making.