Synonym Boundary: "買い物する", "頑張る", "行う", "〜てしまう"

When expressing "do" in Japanese, you must carefully distinguish between "買い物する", "頑張る", "行う", "〜てしまう" based on context.

• 買い物する (かいものする (kaimono suru) - Level: N4): Maps to "to do shopping" and is used when Used when referring to the act of buying things, typically at a store. Can be used with に.
• 頑張る (がんばる (ganbaru) - Level: N4): Maps to "to do one's best, to try hard, to persevere" and is used when A versatile word used to encourage oneself or others to try hard, persist, or endure. Common phrases include 頑張って.
• 行う (おこなう (okonau) - Level: N4): Maps to "to do, to conduct, to carry out, to perform" and is used when More formal than する. Typically used for conducting events, ceremonies, research, or official procedures..
• 〜てしまう (〜てしまう (te shimau) - Level: N3): Maps to "to do completely; to do regrettably/unintentionally" and is used when Expresses either the completion of an action, often implying 'finished doing,' or an action done unintentionally or regrettably. In casual speech, it's often shortened to 〜ちゃう/〜じゃう.

Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!