是非(ぜひ)(by all means) Adverb 例句:ぜひ、参加してください。(ぜひ、さんかしてください。)(Please join by all means.) 易混:必ず ↔ ぜひ(必ず stresses certainty of outcome ('will definitely')/ぜひ stresses strong desire or recommendation ('by all means/please do'), without guaranteeing the outcome; often with requests (ぜひ〜てください) or wishes (ぜひ〜したい).)、必ず行きます。(I'll definitely go.)、ぜひ来てください。(Please do come.)