だけ vs しか(〜ない): The Difference (with Examples)
The core difference
Both mark a limit, but they differ on two things at once — the verb they need, and the mood they carry:
| Form | Core idea | Example |
|---|---|---|
| 〜だけ | 'only / just' — neutral; takes a POSITIVE verb | 千円だけある = I have just 1,000 yen (stated plainly) |
| 〜しか〜ない | 'only / nothing but' — regretful; REQUIRES a negative verb | 千円しかない = I have only 1,000 yen (and it's not enough) |
The grammar rule is simple and unbreakable: しか always pairs with a negative ending, while だけ pairs with a positive one. The feeling follows from that — だけ just reports the amount, しか says the amount falls short.
See it in one situation
Same wallet, same 1,000 yen, two very different attitudes:
財布に千円だけある。
さいふに せんえん だけ ある。
There's just 1,000 yen in my wallet.
だけ + positive ある — a plain statement of how much there is.
財布に千円しかない。
さいふに せんえん しか ない。
I have only 1,000 yen in my wallet.
しか + negative ない — the same amount, but now it feels like too little.
The first is a calm fact. The second quietly complains that it isn't enough — maybe ヤッタン wanted to buy lunch and a book.
〜だけ — the neutral "only"
Use だけ with a positive verb to state a limit without judgment. It attaches straight to nouns, and it can keep the particle を or が, or drop it.
ヤッタンは水だけ飲みました。
ヤッタンは みず だけ のみました。
Yattan drank only water.
Positive verb 飲みました — just naming what was drunk, no complaint.
モチはひらがなだけ読めます。
モチは ひらがな だけ よめます。
Mochi can read only hiragana.
A plain limit; だけ can sit before a particle too, e.g. だけを / だけが.
Because だけ is neutral, it's the natural choice when the amount is fine or even generous: 一人だけ来た can simply mean "one person came" without implying that's disappointing.
Full details: 〜だけ guide.
〜しか〜ない — the "not enough" only
Use しか when you want that "nothing more than / less than hoped" nuance — and remember it forces the verb negative. Importantly, しか replaces を and が (you don't say をしか or がしか).
ヤッタンは水しか飲みませんでした。
ヤッタンは みず しか のみませんでした。
Yattan drank nothing but water.
Negative 飲みませんでした is mandatory; feels like water was all there was.
先生は一人しか来ませんでした。
せんせいは ひとり しか きませんでした。
Only one teacher came.
しか + negative 来ませんでした — and it implies we'd hoped for more.
弟は漢字が少ししか書けない。
おとうとは かんじが すこし しか かけない。
My little brother can write only a little kanji.
しか replaces が here; negative 書けない carries the 'not much' feeling.
For extra emphasis you can even stack them as だけしか〜ない ("only… and nothing more"), which still needs the negative verb: 千円だけしかない.
Full details: 〜しか〜ない guide.
A useful contrast: particle behaviour
- だけ is polite to particles: 水を飲む → 水だけ飲む, or keep it as 水だけを飲む. Both work.
- しか pushes を and が out: 水を飲む → 水しか飲まない (never 水をしか). Other particles like で or に usually stay: ここでしか買えない ("you can buy it only here").
So if the sentence still has を or が sitting next to your "only," you're likely in だけ territory, not しか.
Common mistakes
- Using しか with a positive verb. "I have only 1,000 yen" is 千円しかない, never 千円しかある. If the verb is positive, switch to だけ.
- Keeping を/が in front of しか. Say 水しか飲まない, not 水をしか飲まない. しか absorbs those particles.
- Reaching for しか when you mean a neutral limit. "Just add water" or "one person came (fine)" is だけ; しか would wrongly signal disappointment.
- Forgetting the negative after だけしか. The emphatic combo still needs ない: 千円だけしかない, not 千円だけしかある.
Quick recap
- だけ = neutral "only / just" + positive verb → simply states the limit.
- しか = "nothing more than" + negative verb (しか〜ない) → feels like less than hoped.
- だけ counts what's there; しか regrets what isn't.
- しか replaces を/が; だけ can keep or drop them.
- Emphasis: だけしか〜ない ("only… and no more").
Your turn
Choose だけ or しか(〜ない) for each sentence, and fix the verb polarity to match.
Start the 6-question drill →Frequently asked questions
What's the quickest way to choose between だけ and しか?
Check the verb. だけ takes a positive verb and just states a limit; しか requires a negative verb (しか〜ない) and adds a 'that's all / not enough' feeling. Positive → だけ, negative → しか.
Why is 千円しかある wrong?
しか must be followed by a negative verb. 'I have only 1,000 yen' is 千円しかない (negative ない). If you want a positive verb, use だけ: 千円だけある.
Do だけ and しか change the particles を and が?
しか replaces を and が (say 水しか飲まない, not 水をしか). だけ is more flexible — you can keep them (水だけを飲む) or drop them (水だけ飲む).
What does だけしか mean?
It's だけ and しか stacked for emphasis — 'only… and nothing more.' It still needs a negative verb, e.g. 千円だけしかない ('only 1,000 yen, and that's all').
The patterns compared here
Full guide for each pattern in this comparison: