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つけるべきだ

should be careful

→ つける
phrase Rare #30,648
should be careful Most commonly used in 気をつけるべきだ, meaning “should be careful.” べき expresses what someone should do.
JA: 道路を渡るときは、車に気をつけるべきだ。
EN: You should watch out for cars when crossing the road.