～ことだ JLPT N3 Neutral
〜koto da
Expresses advice or recommendation; 'should', 'it is important', 'it is necessary'.
Neutral, direct advice - "you should.../it's important to...".
Formation
Verb-ますstem + ことだ, い-Adjective + ことだ, な-Adjective + なことだ, Noun + のことだ
Explanation
The ～ことだ grammar point is used to express a piece of advice or recommendation to someone. It can be translated as 'should', 'it is important', or 'it is necessary' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.
Example sentences
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You should exercise every day.
Mainichi undou suru koto da.
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For your health, you should eat lots of vegetables.
Kenkou no tame ni, yasai wo takusan taberu koto da.
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When studying, you should choose a quiet place.
Benkyou shiteiru toki, shizuka na basho wo erabu koto da.
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You should use a dictionary to learn new words.
Jisho wo tsukatte, atarashii kotoba wo oboeru koto da.