🦅 Project Eagle
Quadruple VS

Synonym Boundary: "大丈夫", "一生懸命", "是非", "一度に"

All represent the core concept "all", but require precise selection.

Japanese Option A

大丈夫

だいじょうぶ (daijōbu)
N5 / CEFR
Japanese Option B

一生懸命

いっしょうけんめい (isshōkenmei)
N3 / CEFR
Japanese Option C

是非

ぜひ (zehi)
N3 / CEFR
Japanese Option D

一度に

いちどに (ichido ni)
N3 / CEFR

Quadruple VS Nuance Contrast & Social Differences

When expressing "all" in Japanese, you must carefully distinguish between "大丈夫", "一生懸命", "是非", "一度に" based on context.
  • 大丈夫 (だいじょうぶ (daijōbu) - Level: N5): Maps to "all right, okay, no problem" and is used when An な-adjective. Used to confirm safety, well-being, or acceptability. Can also be used to refuse politely..
  • 一生懸命 (いっしょうけんめい (isshōkenmei) - Level: N3): Maps to "with all one's might; very hard; desperately" and is used when Commonly used as an adverb to describe doing something with great effort, dedication, or intensity. It emphasizes putting maximum effort into an action..
  • 是非 (ぜひ (zehi) - Level: N3): Maps to "by all means, definitely, without fail" and is used when Expresses a strong desire or request, often used with ください.
  • 一度に (いちどに (ichido ni) - Level: N3): Maps to "all at once, simultaneously" and is used when Indicates that multiple things happen or are done at the same time or in a single attempt..
Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!
Context for "大丈夫"
転んでしまいましたが、大丈夫です。
I fell down, but I'm okay.
Context for "一生懸命"
彼は一生懸命日本語を勉強しています。
He is studying Japanese very hard.
Context for "是非"
今度、ぜひ私の家にも遊びに来てください。
Please do come visit my house next time, by all means.
Context for "一度に"
一度にたくさんの質問をしました。
I asked many questions all at once.

Synonym Mastery Challenge

Which Japanese word perfectly fits this blank space?

Fill in the blank: "転んでしまいましたが、 ___ です。" (Meaning: "I fell down, but I'm okay.")
🎉 Correct Answer!

Remember: "大丈夫" is correct here because it represents "all right, okay, no problem" in the context: "I fell down, but I'm okay.".

💡 Practice with AI! Live

Don't just read. Practice speaking this grammar with our interactive AI coach for free!

Try AI Speaking 👉