Basic: 火災を防ぐ方法を学びましょう。 (Kasai o fusegu houhou o manabimashou.) - Let's learn how to prevent fires.

Intermediate: この城は外敵の侵入を防ぐために建てられました。 (Kono shiro wa gaiteki no shinnyuu o fusegu tame ni tateraremashita.) - This castle was built to defend against external invaders.

Advanced: 彼の優れた分析力は、会社の危機を未然に防ぐ役割を果たしました。 (Kare no sugureta bunsekiryoku wa, kaisha no kiki o mizen ni fusegu yakuwari o hatashimashita.) - His excellent analytical skills played a role in preventing the company's crisis before it occurred.