Grammar Rule in 30 Seconds
Use ~かねる to politely decline or express inability to perform an action in formal business or social settings.
- Attach to the stem (masu-stem) of a verb: {理解|りかい}しかねる (I cannot understand).
- Used primarily for formal, objective, or polite refusal of requests.
- It implies a psychological or situational difficulty rather than a physical impossibility.
Overview
wa). The grammar pattern ~かねる (~kaneru) is an essential B2-level tool for navigating these situations with sophistication. It's far more nuanced than a simple できません (dekimasen, "I can't").~かねる expresses an inability or unwillingness to perform an action not because of a lack of skill, but due to conflicting circumstances, rules, principles, or a sense of inappropriateness. It conveys the message, I would like to help, but something prevents me,thereby softening the refusal and showing respect for the request.
~かねる indicates that you have considered the request seriously but are unable to comply. This is crucial for maintaining professional relationships, as it shifts the reason for refusal from personal unwillingness to external or principled constraints.~かねる allows you to communicate negative or difficult responses with a high degree of politeness and professionalism, a hallmark of advanced Japanese proficiency.Conjugation Table
| Verb Type | Dictionary Form | Masu Form | Masu-Stem | Plain Form | Polite Form | Past Polite | Te-Form (Progressive) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| :---------- | :---------------- | :---------- | :---------- | :----------- | :-------------- | :-------------- | :------------------------ | |||||||||
| Godan (Gr 1) | {言 | い}う iu |
{言 | い}います iimasu |
{言 | い}い ii |
{言 | い}いかねる iikaneru |
{言 | い}いかねます iikanemasu |
{言 | い}いかねました iikanemashita |
{言 | い}いかねている iikaneteiru |
||
| Ichidan (Gr 2) | {決 | き}める kimeru |
{決 | き}めます kimemasu |
{決 | き}め kime |
{決 | き}めかねる kimekaneru |
{決 | き}めかねます kimekanemasu |
{決 | き}めかねました kimekanemashita |
{決 | き}めかねている kimekaneteiru |
||
| Irregular (する) | する suru |
します shimasu |
し shi |
しかねる shikaneru |
しかねます shikanemasu |
しかねました shikanemashita |
しかねている shikaneteiru |
|||||||||
| Irregular (くる) | くる kuru |
きます kimasu |
き ki |
きかねる kikaneru |
きかねます kikanemasu |
きかねました kikanemashita |
きかねている kikaneteiru |
|||||||||
A Note on Humble Forms: In business contexts, you will frequently encounter the humble form いたしかねます (itashikanemasu), derived from いたす (itasu, the humble form of する). For instance, `{対応 |
たいおう}いたしかねます (taiō itashikanemasu`, we are unable to handle/respond). |
How This Grammar Works
~かねる functions as a kind of anti-potential verb. While the standard potential form (~れる/~られる) confirms the existence of ability or possibility, ~かねる confirms the impossibility of execution due to non-physical constraints. The action itself is grammatically possible, but the speaker declares it cannot be performed in the current situation.賛成しかねます (sansei shikanemasu), you are not saying you lack the cognitive ability to agree. You are stating that, having considered the matter, you find it impossible to lend your agreement due to logical inconsistencies, moral objections, or conflicting interests. The grammar externalizes the reason for the inability, framing it as a reluctant conclusion rather than a simple personal choice.~かねる. This structure isolates the *action* as the problematic element. It's not "I can't, but rather Doing X is difficult/impossible for me to carry out." This subtle shift is what separates a blunt refusal from a considered, professional response, showing that you understand the request but are bound by other factors.
Formation Pattern
~かねる is consistent and straightforward. You simply append it to the masu-stem of a verb.
返事する, henjisuru).
返事します, henjishimasu).
ます (返事し, henjishi).
~かねる form. For a polite, formal email, you would use 返事しかねます (henjishikanemasu).
答える (to answer) → 答え (kotae) → お答えかねます (okotaekanemasu, I am unable to answer).
引き受ける (to accept a task) → 引き受け (hikiuke) → 引き受けかねます (hikiukekanemasu, I cannot accept this task).
~かねる cannot be attached to potential, passive, or causative verb forms. It must attach to the stem of the core action verb. It already contains the meaning of inability, so adding it to a potential form like 食べられる (taberareru) would be redundant and grammatically incorrect.
When To Use It
~かねる is as important as knowing how to form it. Its use is almost exclusively reserved for formal and semi-formal contexts where politeness and indirectness are valued.~かねます is standard practice. It softens the blow by implying the decision is based on policy, not personal whim.{申し訳ございませんが、そのご要望にはお応えしかねます。}Mōshiwake gozaimasen ga, sono go yōbō ni wa o-kotae shikanemasu.~かねる can describe a state of being unable to come to a decision, often because the options are complex or have significant consequences. The progressive ~かねている is common here.{A案とB案のどちらを選ぶべきか、決めかねています。}A-an to B-an no dochira o erabu beki ka, kimekaneteimasu.~かねる is used to state what an organization cannot or will not do in a formal, definitive tone.{本サービス利用中に生じたいかなる損害についても、弊社は一切の責任を負いかねます。}Hon sābisu riyō-chū ni shōjita ikanaru songai ni tsuitemo, heisha wa issai no sekinin o oikanemasu.I disagree (反対です), ~かねる can be used to show you cannot bring yourself to agree with a proposal or opinion. It implies you've thought about it but cannot reconcile it with your own view.{そのご意見には、少々賛成しかねます。}Sono go-iken ni wa, shōshō sansei shikanemasu.
Common Mistakes
~かねる by applying it too broadly. Avoiding these specific errors is key to using it correctly and naturally.~かねる implies a situational or principled reason, not a lack of physical power or knowledge. If you can't lift a box, you say {重くて持てません} (omokute motemasen), not *持ちかねます. If you can't speak a language, it's {話せません} (hanasemasen), not *話しかねます. The latter would bizarrely imply you know the language but are refusing to speak it for some profound reason.~かねます with friends or family sounds incredibly stiff and creates emotional distance. It can even be interpreted as sarcastic. If a friend asks for help moving, {ごめん、明日はちょっと手伝えない} (gomen, ashita wa chotto tetsudaenai) is natural. {明日はお手伝いしかねます} (ashita wa o-tetsudai shikanemasu) sounds like you are formally severing ties.~かねない (~kanenai): This is a critical error as they have nearly opposite meanings. ~かねる means you cannot/are unable to do something (usually a requested action). ~かねない is a warning that someone might do something undesirable. • {約束はしかねます} (yakusoku wa shikanemasu) = I can't promise. (My action)• {彼ならやりかねない} (kare nara yarikanenai) = He might actually do it. (Someone else's negative potential){分かりません} (wakarimasen). Using {分かりかねます} (wakarikanemasu) implies you might know the information but are unable to disclose it due to policy or confidentiality. A tourist asking for directions would be baffled by such a response.Contrast With Similar Patterns
Choosing the right expression for cannot or difficult depends entirely on the nature of the obstacle. ~かねる is just one piece of a larger puzzle.
| Pattern | Core Nuance | Nature of Difficulty | Example Sentence |
|:--------|:------------|:---------------------|:-----------------|
| ~かねる | Situational/Social Inappropriateness | Blocked by rules, principles, or circumstances. A formal, reluctant inability. | {個人情報に関わるご質問にはお答えしかねます。} (Kojin jōhō ni kakawaru go-shitsumon ni wa o-kotae shikanemasu. — I cannot answer questions related to personal information.) |
| ~できない | Factual Inability / Lack of Capability | A straightforward declaration of no ability, skill, or possibility. Neutral politeness. | {私は運転できません。} (Watashi wa unten dekimasen. — I cannot drive.) |
| ~がたい | Emotional/Psychological Difficulty | The action is hard to perform because it goes against one's feelings or beliefs. It feels wrong or is hard to accept. | {彼がしたことは、到底許しがたい。} (Kare ga shita koto wa, tōtei yurushigatai. — What he did is truly unforgivable.) |
| ~にくい | Practical/Inherent Difficulty | The action is physically difficult due to the properties of the object or task itself. | {このペンはインクが出にくくて書きにくい。} (Kono pen wa inku ga denikukute kakinikui. — This pen is hard to write with because the ink doesn't flow well.) |
Real Conversations
Observing ~かねる in context shows how it functions to preserve professional decorum.
Scenario 1: A Work Email Responding to a Request
Subject
山田部長
ご連絡ありがとうございます。新機能の追加のご依頼ですが、現在のプロジェクトが佳境にあり、開発リソースが不足しております。大変恐縮ですが、ご提示のスケジュールでの対応はいたしかねます。来月であれば調整可能かと存じますので、ご検討いただけますと幸いです。
--Sato
*Analysis:* Sato uses the humble いたしかねます to politely refuse the proposed schedule. This is much softer than できません and frames the issue as one of limited resources, not unwillingness, while proposing an alternative.
Scenario 2: Formal News Commentary
Analyst on TV: 「政府の新たな方針について、専門家としては楽観的な見方をすることはできかねます。いくつかの重大な問題点が見過ごされていると言わざるを得ません。」
(Seifu no arata na hōshin ni tsuite, senmonka toshite wa rakkanteki na mikata o suru koto wa dekikanemasu. Ikutsuka no jūdaina mondaiten ga misugosareteiru to iwazaru o emasen.)
*Analysis:* The analyst uses できかねます (a combination of できる and かねます) to express a strong, principled inability to be optimistic. It carries more weight than a simple できません, suggesting that their professional judgment makes optimism impossible.
Scenario 3: Internal Deliberation (Spoken Monologue)
Manager thinking aloud: 「彼をこのプロジェクトのリーダーに推薦すべきか… 経験は申し分ないが、チームとの協調性を考えると、どうも即決しかねるな…」
(Kare o kono purojekuto no rīdā ni suisen subeki ka... Keiken wa mōshibun nai ga, chīmu to no kyōchōsei o kangaeru to, dōmo sokketsu shikaneruna...)
*Analysis:* Here, the plain form しかねる is used in an internal thought process. It perfectly captures the manager's hesitation and inability to make a quick decision due to conflicting factors (skill vs. teamwork).
Progressive Practice
Move from recognition to active use with these exercises.
Nuance Transformation: For each sentence below, decide if ~かねます is a more appropriate substitute for できません. If so, rewrite it. If not, explain why.
- Context: A store clerk to a customer. 「すみません、この店では魚は売っていません。」
- Context: A company spokesperson about a data leak. 「お客様の個人情報に関する詳細は、現時点では公表できません。」
- Context: A student explaining to a teacher. 「熱があったので、昨日は宿題ができませんでした。」
Scenario Response: Write a polite, formal Japanese sentence using ~かねる for each situation.
- You are an HR manager. An employee asks for an extra week of vacation beyond their allowance. Refuse politely.
- You are on a committee. You are asked to approve a budget that you believe is irresponsible. Express your inability to agree.
- A colleague asks you to finish a report for them by 5 PM, but you are overloaded. Explain the difficulty.
Error Correction: Identify and correct the error in each sentence. Explain the mistake.
- *ピアノが下手なので、みんなの前で弾きかねます。
- *友達：「今週末、映画に行かない？」あなた：「ごめん、行きかねる。」
- *あの政治家は、また嘘をつきかねる。
Quick FAQ
Can I use the plain form ~かねる in conversation?
It's very rare in conversation. The plain form sounds strong, formal, and somewhat literary or dramatic. You will almost always use the polite ~かねます when speaking. The plain form is better suited for formal written documents or for expressing internal thought.
What’s the real difference between {決められない} (kimerarenai) and {決めかねる} (kimekaneru)?
{決められない} is a neutral statement of inability—you just can't decide, perhaps due to lack of information or simple indecisiveness. {決めかねる} implies a prolonged and difficult struggle. You have considered the options, but they are in conflict, making a decision difficult on a deeper level.
Is ~かねる always a hard no?
While it's used in refusals, its core function is expressing the *inability to proceed*. This could be a final no (返品は致しかねます - We cannot do returns), or it can express ongoing difficulty (決めかねている - I'm struggling to decide). The context determines its finality.
Can I use ~かねる for positive things?
No. By definition, ~かねる expresses difficulty or inability, so it is only used in negative contexts. You cannot use it to say you are
unable to be sad; it is about being unable to perform a requested or necessary action.
Formation Table
| Verb Type | Stem | Result |
|---|---|---|
|
Godan
|
書く -> 書き
|
書きかねる
|
|
Ichidan
|
食べる -> 食べ
|
食べかねる
|
|
Irregular
|
する -> し
|
しかねる
|
|
Irregular
|
来る -> 来(こ)
|
来(こ)かねる
|
Meanings
Expresses that the speaker is unable to do something, often used to soften a refusal or express hesitation in formal contexts.
Polite Refusal
Declining a request politely.
“ご要望には応じかねます。”
“その提案は受け入れかねます。”
Psychological Inability
Unable to bring oneself to do something.
“彼の態度には納得しかねる。”
“そんなことは認めかねる。”
Reference Table
| 动词类别 | ます形词干 | 语法形式 | 语境含义 |
|---|---|---|---|
|
一类动词
|
分かり (wakari)
|
分かりかねます
|
礼貌地表示“我不知道”
|
|
二类动词
|
見 (mi)
|
見かねる
|
看不下去/不忍目睹
|
|
三类动词
|
し (shi)
|
いたしかねます
|
极其正式的拒绝
|
|
心理状态
|
決め (kime)
|
決めかねる
|
难以做出决定
|
|
期待心情
|
待ち (machi)
|
待ちかねる
|
迫不及待（积极期待）
|
|
官方拒绝
|
お答え (okotae)
|
お答えしかねます
|
无法作答（官方口吻）
|
正式程度
受け入れかねます。 (Business refusal)
受け入れられません。 (Business refusal)
受け入れられないよ。 (Business refusal)
無理。 (Business refusal)
~かねる 的多种用法
社交/政策
- 返品はいたしかねます 我们无法接受退货
- お答えしかねます 我无法回答那个问题
心理状态
- 決めかねる 无法决定
- 選びかねる 难以抉择
固定词组
- 待ちかねる 等不及了！
- 見かねる 不忍直视/看不下去
体力技能 vs. 社交边界
我该用哪个“不能”？
是身体能力或基本技能吗？
是社交拒绝或公司政策吗？
~かねる 的常用搭配词组
商务/拒绝
- • いたしかねます
- • お答えしかねます
犹豫/纠结
- • 決めかねる
- • 選びかねる
高度期待
- • 待ちかねる
按水平分级的例句
それはできません。
I cannot do that.
すみません、わかりません。
Sorry, I don't know.
行けません。
I cannot go.
食べられません。
I cannot eat it.
その件は、お答えしかねます。
I cannot answer that matter.
ご要望には応じかねます。
I cannot meet your request.
判断しかねます。
I cannot judge.
納得しかねる。
I cannot accept/understand.
今の状況では、承諾しかねます。
Under current circumstances, I cannot accept.
そのような提案は受け入れかねる。
I cannot accept such a proposal.
彼を信じかねる。
I find it hard to trust him.
返答しかねる質問です。
It is a question I cannot answer.
誠に恐縮ですが、ご希望には添いかねます。
I am very sorry, but I cannot meet your expectations.
その計画には賛成しかねる。
I cannot agree with that plan.
詳細については、現時点では申し上げかねます。
I cannot comment on the details at this time.
ご期待に沿いかねる結果となりました。
The result was one that could not meet your expectations.
彼の真意を測りかねる。
I cannot gauge his true intentions.
この事態を看過しかねる。
I cannot overlook this situation.
現状を放置することは、断じて容認しかねる。
I absolutely cannot tolerate leaving the situation as is.
彼らの行動は理解に苦しみ、納得しかねる。
Their actions are hard to understand, and I cannot accept them.
かかる非礼は、到底看過しかねるものである。
Such rudeness is something I cannot possibly overlook.
その論理には、いささか同意しかねる点がある。
There are points in that logic with which I cannot quite agree.
事の次第を鑑みれば、即断しかねるのも無理はない。
Considering the circumstances, it is no wonder that one cannot decide immediately.
この度の決定には、遺憾ながら賛同しかねる。
Regrettably, I cannot support this decision.
容易混淆
Sounds similar but means 'might happen'.
常见错误
重くて持ちかねる
重くて持てない
明日行けかねる
明日行けません
理解かねる
理解しかねる
それは起こりかねる
それは起こりかねない
句型
その件については、___しかねます。
Real World Usage
返金は致しかねます。
最强的职场挡箭牌
健身房里别乱用
充满期待的例外
Smart Tips
Use ~かねます to sound professional.
发音
Intonation
The intonation should be flat and professional, avoiding rising pitch at the end.
Formal
〜かねます↓
Finality and professional distance.
记住它
记忆技巧
Think of 'Ka-ne-ru' as 'Can-not-rule'. If you can't rule it in, you have to rule it out politely.
视觉联想
Imagine a polite waiter bowing deeply while saying 'I cannot' (かねる) to a customer's impossible request.
Rhyme
When you want to say no, and keep it polite, use ~かねる to make it sound right.
Story
Tanaka-san was asked to work on Sunday. He wanted to say no. He didn't say 'Dame!' (No!). Instead, he said 'Shukujitsu wa shukkou shikanemasu' (I cannot work on holidays). His boss was impressed by his politeness.
Word Web
挑战
Write three sentences using ~かねる for things you would politely decline in a business meeting.
文化笔记
Refusal is often indirect. ~かねる is the perfect tool for this.
Derived from the verb 'kaneru' (to combine/to be difficult).
对话开场白
その計画についてどう思いますか？
日记主题
常见错误
Test Yourself
お客様、そのご{要望|ようぼう}にはお{应|こた}え___。
选择正确的句子：
その質問にはお答えるしかねます。
Score: /3
练习题
1 exercisesその提案は受け入れ___。
Score: /1
Practice Bank
10 exercises担当者が不在のため、詳細は___。
これ以上の{值引|ねび}きは、私の一存では___。
そのような要求は、断固として___。
彼女が嘘をつくなんて、信じかねる。
ファンの皆さんが、あなたの登場を___います。
AかBか / 選び / かねて / いる
あなたの計画には賛成しかねます。
I am sorry, but we cannot accept returns.
苦しそうな猫を___、病院へ連れて行った。
卒業後の進路をまだ___。
Score: /10
常见问题 (1)
No, it is too formal.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
No puedo
Register.
Je ne peux pas
Face-saving.
Ich kann nicht
Politeness.
できない
Formality.
لا أستطيع
Indirectness.
不能
Auxiliary usage.
Learning Path
Prerequisites
Related Grammar Rules
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