# やしない: should do, but don't; absolutely not; there's no way ~ > Learn how to use やしない, a JLPT N1 Japanese grammar point meaning should do, but don't; absolutely not; there's no way ~, with structure, nuance, examples, mistakes, and comparisons. JLPT level: N1 · Updated: 2026-05-18 · Canonical: https://hane-app.com/blog/n1-ya-shinai/ **やしない** means **should do, but don't; absolutely not; there's no way ~**. It is a **JLPT N1** Japanese grammar pattern used to express that something is not done or doesn't happen despite expectations, often with strong negation or frustration. This grammar point often appears in colloquial speech, dramatic narration, and JLPT N1 reading passages. If you want to express that something is not done or doesn't happen despite expectations, **やしない** is a useful pattern to learn because it adds natural precision to your Japanese. ## What does やしない mean? Use **やしない** when you want to express that something is not done or doesn't happen despite expectations. Natural translations include: - should do, but don't; absolutely not; there's no way ~ The best translation depends on the sentence. Try to notice the writer's or speaker's purpose first, then choose the English phrase that fits that context. ## How to form やしない The pattern attaches to the **stem of a verb** (the -ます form without ます). For る-verbs, drop る and attach やしない; for う-verbs, change to the い-row and add やしない. Irregular verbs: する becomes しやしない, くる becomes きやしない.
Vstem + やしない → 行き(いき)やしない
The verb stem is the base before ます: 食べ(たべ)(ます) → 食べ(たべ)やしない, 書き(かき)ます → 書き(かき)やしない, します → しやしない. The form before the grammar point matters. In JLPT questions, the wrong answer choices often use a similar meaning but attach it to the wrong type of word. ## When is やしない used? Use **やしない** in situations like: - negating an expected action with frustration or resignation - emphasizing that something never happens - expressing personal reactions, reasoning, or observations - connecting ideas in formal and informal contexts Tone and register: - highly casual, sometimes rude; often used in exasperated speech or inner monologue - Common in test questions, manga, daily conversation, and JLPT N1 reading ## やしない example sentences
彼(かれ)はどうせ来きやしないよ。
He won't come anyway; no way he'll come.
casual
いくら説明せつめいしたって、理解りかいしやしない。
No matter how much you explain, they'll never understand.
frustrated
試験しけんに受うかりやしないと思おもう。
I think I'll never pass the exam.
resigned
そんな急きゅうに言いっても、準備じゅんびなんてできやしない。
Even if you say that so suddenly, there's no way I can prepare.
casual
約束やくそくしたって、守まもりやしないんだから。
Even though he promised, he'll never keep it.
disappointed
After reading each sentence, ask what job **やしない** is doing: something is not done or doesn't happen despite expectations. That makes the nuance easier to remember than a one-word translation. ## Nuance of やしない The key nuance is **something is not done or doesn't happen despite expectations**. This matters because learners often translate advanced grammar too literally. A pattern may look simple, but it can signal the writer's attitude, the scope of a rule, or the relationship between two ideas. For example: - In context, it carries a specific, nuanced meaning that a simpler pattern would not convey. - Compared with **はしない**, it carries a different weight and implication. ## やしない vs はしない Both **やしない** and **はしない** can express related ideas, but they are different.
やしない
absolutely not; never (colloquial, stronger negative)
When the speaker feels the action is utterly impossible or won't happen, often with emotion.
彼かれは許ゆるしやしない。
He'll never forgive.
vs
はしない
won't; does not (emphatic but less emotional)
Standard emphatic negative, less colloquial. Often used in writing.
彼かれは許ゆるしはしない。
He won't forgive (and that's a fact).
If both translations seem possible, check the tone. Is the sentence casual, formal, written, explanatory, or emotional? The tone often tells you which grammar point is natural. ## Common mistakes with やしない
❌
食べ(たべ)らない → 食べ(たべ)やしない (wrong: confusing with potential form)
✅
食べ(たべ)やしない (correct: stem + やしない)
Don’t treat it like a negative potential; it’s simply a strong negation of the action.
❌
行か(いか)ない vs 行き(いき)やしない in a situation needing "never" nuance
✅
行き(いき)やしない for "there's no way I'll go"
Plain negative 行か(いか)ない just states "won't go", while やしない adds the "no way, never" feeling.
A helpful practice method is to write one sentence with **やしない**, then rewrite it with **はしない**. If the meaning or tone changes, explain that difference in your own words. ## Is やしない on the JLPT?
JLPT N1

やしない is commonly tested as JLPT N1 grammar, appearing in the "Grammar" and "Reading" sections.

That means learners should be able to: - recognize it in reading - understand its nuance in context - use it in simple original sentences For test preparation, study the grammar point in full sentences. JLPT questions often test whether you understand the surrounding context, not just the dictionary meaning. ## Practice questions for やしない
1
Use やしない in a sentence about a personal experience where something you expected never happened.
write
2
Rewrite the sentence you wrote using はしない. How does the feeling change?
compare
3
Given a dialogue about a procrastinator, try to complete the sentence with やしない: 「また明日(あした)やるって…　どうせやり___」
fill
Keep your first sentences simple. Once the structure feels natural, add more context so the nuance becomes clear. ## Learning path for やしない
1
Memorize the stem attachment rule: take the verb's stem (ます-form minus ます) and add やしない.
2
Next, compare it with や否(いな)や and ようが～ようが to see how different emphatic patterns work.
3
Listen for やしない in anime or dramas; note the emotional tone (frustration, resignation).
4
Finally, write sentences where やしない is necessary; then check whether replacing it with one of the related patterns below changes the meaning.
## Related grammar to review next - [や否(いな)や](/blog/n1-ya-ina-ya/) — because it also uses や in a different emphatic structure - [やれ～やれ](/blog/n1-yare-yare/) — because it also shows strong, colloquial emphasis - [ようが～ようが／ようと～ようと](/blog/n1-you-ga-you-ga-you-to-you-to/) — because it also expresses “no matter what” with a strong stance - [わ～わで](/blog/n1-wa-wade/) — because it also adds emotional weight to statements ## Learn やしない with Hane If you want to review **やしない** together with the related patterns above, Hane helps you practice Japanese in short, focused sessions. Browse more lessons here: - [All grammar lessons](/blog/) - [JLPT N1 grammar lessons](/blog/n1/)