A Japanese castle tower behind cherry blossoms

Japanese Articles

か [ka], かな [kana], and っけ [kke]: How to use these Japanese sentence-ending particles?

By: Mayumi Ito Tue Jun 09 2026

Particles, Sentence Structure

In Japanese, the sentence-ending particles か[ka], かな[kana], and っけ[kke] are all added to sentences that express some degree of uncertainty. You might use one of these particles when you are asking a question, expressing doubt, or indicating your memory is uncertain. Here’s a basic summary:

か[ka] → Marks questions, but also some sentences that have other functions.
かな[kana] → Used to express uncertainty, as in “I wonder if…” or “I don’t know if…”
っけ[kke] → To express that you’re not certain your memory is correct.

In this post, we’ll look at all the uses of these three particles with some examples. We’ll also pay special attention to how the intonation affects the meaning of each particle. Let’s get started!

How to use か [ka] in Japanese?

The Japanese particle か[ka] is used to mark the end of a question. For this reason, it is often called the “question particle.”

In a question

To mark that a Japanese sentence is a question, we simply add the question particle か[ka] at the end of the sentence and use a rising intonation. In writing, we don’t need a question mark as long as か[ka] is there.

学生さんですか。➚

Gakusei-san desu ka. ➚

Are you a student?

→ a

学校はどちらですか。➚

Gakkō wa dochira desu ka. ➚

What school do you go to?

→ a

You’ll also use か[ka] at the end of a question that appears within a sentence (an “indirect question”), however, your intonation doesn’t go up in those cases.

会議が何時に始まるか ➙まだ聞いていない。

Kaigi ga nanji ni hajimaru ka ➙ mada kiite inai.

I still haven’t heard what time the meeting starts.

→ an

Important

In the plain style of speech, the question marker か[ka] is often omitted, especially by female speakers, to soften the tone. In such cases, the rising tone still indicates that it’s a question and in writing, a question mark may be added for clarification.

ラーメン、食べるか。➚

Rāmen, taberu ka. ➚

Wanna eat ramen?

→ sounds rough

ラーメン、食べる？➚

Rāmen, taberu? ➚

Wanna eat ramen?

→ sounds gentle

When you add か[ka] to a phrase that ends with na-adjective + だ[da] or noun + だ[da], then だ[da] is omitted. Even if か[ka] is omitted to soften the question, だ[da] cannot be present. Compare:

Statement	明日はひまだ。 Ashita wa hima da. I’m free tomorrow.
Question with か (sounds rough)	明日はひまか。➚ Ashita wa hima ka. ➚ Are you free tomorrow?	❌ 明日はひまだか。 Ashita wa hima da ka.
Question without か (sounds soft)	明日はひま？➚ Ashita wa hima? ➚ Are you free tomorrow?	❌ 明日はひまだ? Ashita wa hima da?

To express doubt or uncertainty

The particle か[ka] can be used to express doubt or uncertainty in the following structure. The intonation doesn’t go up.

dictionary form

だろう / でしょう

darō / deshō

か

子供たちだけで大丈夫でしょうか。➙

Kodomotachi dake de daijōbu deshō ka. ➙

I wonder if the children are alright on their own.

You might also use か[ka] to indicate that you’re still processing information, and so it’s somewhat thus uncertain. The intonation may go down if the speaker is deeply impressed or troubled by the information.

Speaker A:

明日は雪になるそうですよ。

Ashita wa yuki ni naru sō desu yo.

I’ve heard that it’s going to snow tomorrow.

Speaker B:

えっ、そうですか。➙ / ➘ 困ったなあ。

E, sō desu ka. ➙ / ➘ Komatta nā.

Oh, is that so? That’s not good.

To suggest that someone do something

We can use か[ka] in a negative question form to invite or urge the listener to do something.

明日うちに来ませんか。➚

Ashita uchi ni kimasen ka. ➚

Why don’t you come to my place tomorrow?

ふくれるのもいい加減にしないか。➙

Fukureru no mo ii kagen ni shinai ka. ➙

Why don’t you stop sulking already?

In negative tag questions

You can use か[ka] to form a couple types of negative tag questions, (little questions like “isn’t it?” or “don’t you?” that encourage the listener to reconsider). Use the structure below:

dictionary form

じゃない (です)

ja nai (desu)

か

だから言ったじゃないか。➙ / ➘

Dakara itta ja nai ka. ➙ / ➘

I told you so, didn’t I!

→ an accusation

大丈夫！まだ明日もあるじゃないですか。➙

Daijōbu! Mada ashita mo aru ja nai desu ka. ➙

It’s all right! You still have another chance tomorrow, don’t you?

→ an encouragement

ほら、昔ここに映画館があったじゃないですか。➙

Hora, mukashi koko ni eigakan ga atta ja nai desu ka. ➙

You see, there once was a movie theater here, right?

→ activating the listener’s knowledge

A couple of notes:

In the casual style of speech, female speakers usually drop か from the structure above to soften the tone, as in:
だから言ったじゃない 。
Dakara itta ja nai.
I told you so, didn’t I?
Usually, the intonation is flat or falling, but if we use じゃない[ja nai] without か as in the example below, the intonation may be rising:
映画館があったじゃない ? ➚
Eigakan ga atta ja nai?
There was a movie theater, right?

To accept a new fact

You can use か[ka] to indicate that you’ve discovered some new fact on the topic you already had a some knowledge about, and have accepted it.

ああ、犯人は執事だったか。➙

Ā, han’nin wa shitsuji datta ka. ➙

Oh, it was the butler who had done it.　

→ The speaker knew the butler was one of the suspects, but was personally suspecting someone else.

How to use かな [kana]?

Usually, かな[kana] is added to the end of a sentence is to indicate that the speaker has a doubt whether what they’re saying is true as in “I wonder…” or “I’m not sure if…” in English. It’s usually used in the plain style of speech.

かな[kana] is often used when the speaker is talking to themselves.
(クンクン) この豆腐、まだ大丈夫かな。➙
(kunkun) Kono tōfu, mada daijōbu kana. ➙
(Sniff sniff) I wonder if this tōfu is still OK.
When there is a listener, かな[kana] can also work as a question marker. The intonation still doesn’t go up.
Speaker A:
明日も雨かな。➙
Ashita mo ame kana. ➙
Do you think it’s going to rain tomorrow too?
Speaker B:
うん、たぶん。
Un, tabun.
Yeah, probably.
Older male speakers sometimes use the polite form + かな[kana] to ask a question.
明日も雨ですかな。➙
Ashita mo ame desu kana. ➙
Do you think it’s going to rain tomorrow too?

Important

When used after a sentence ending in a na-adjective + だ[da] or a noun + だ[da], you’ll need to drop だ[da] before adding かな[kana]. You can see this in the examples above, where we didn’t say:

❌ 大丈夫だかな

…daijōbu da kana

❌ 雨だかな

…ame da kana

Tip

There are a couple of cases when かな[kana] will follow の[no]. Alongside a na-adjective or noun, this will be なの[na no]:

Usually, adding の[no] or なの[wa no] produces little change in meaning.
これ、おいしいのかな。
Kore oishii no kana.
I wonder if this is tasty.
In long questions, with question words such as どうして[dōshite](why), you must add の[no] or なの[wa no]:
どうして来ないのかな。
Dōshite konai no kana.
I wonder why they don’t come.
In short questions, we can do without の[no] or なの[wa no]:
どうしてかな。
Dōshite kana.
Why is it?

How to use っけ [kke]?

The sentence-ending particle っけ[kke] is most often used to indicate that the speaker’s memories are uncertain. This particle generally follows the ta-form of the verb.

スマホ、どこに置いたっけ。➙

Sumaho, doko ni oitakke. ➙

Where on earth did I put my smartphone?

→ Speaking to yourself, trying to remember.

The particle っけ[kke] itself is a casual expression, but we can use it in the polite style of speech along with a sentence ending like 〜ました[...mashita] or 〜でした[...deshita] including their negative forms.

Speaker A:

すみません、会議は１２時からでしたっけ。➙

Sumimasen, kaigi wa jūni ji kara deshitakke. ➙

Excuse me, (I don’t remember clearly but) does the meeting start at noon?

→ Seeking confirmation by expressing your memory is uncertain.

Speaker B:

いえ、２時からですよ。

Ie, ni ji kara desu yo.

No, it starts at 2:00.

Tip

Remember that you can also use よね[yo ne] or ね[ne] to confirm something! In the scale of uncertainty, っけ[kke] is a clear winner, followed by よね[yo ne] and then ね[ne]!

How to use っけ [kke] in different tenses

The particle っけ[kke] is always used in the form たっけ[takke] or だっけ[dakke], even when you’re wondering about the present or future.

Past Tense

Past tense forms in Japanese already end with た[ta] or だ[da], so if you’re uncertain about something that happened in the past, you can simply add っけ[kke] without further changes.

Exception!

The polite past form of i-adjectives don’t end with た[ta] or だ[da]. If you want to add っけ[kke] to one of these, use this structure:

past plain form

んでした

ndeshita

っけ

kke

For example:

Meaning	Correct ✅	Incorrect ❌
“Was it good?”	よかったんでしたっけ yokatta ndeshita kke	❌ よかったですっけ yokatta desu kke
“Was it good?”	よくなかったんでしたっけ yokunakatta ndeshita kke	❌ よくなかったですっけ yokunakatta desu kke

Present or Future Tense

If you want to use っけ[kke] to express uncertainty about a present or future event, you can use the following structure:

dictionary form

(nonpast)

んだ / んでした

nda / ndeshita

っけ

kke

For example:

Meaning	Formality	Correct ✅	Incorrect ❌
“Are we going?”	Casual	行くんだっけ ikunda kke	❌ 行くっけ ikukke
“Are we going?”	Polite	行くんでしたっけ ikundeshita kke	❌ 行きますっけ ikimasu kke
“Aren’t we going?”	Casual	行かないんだっけ ikanainda kke	❌ 行かないっけ ikanai kke
“Aren’t we going?”	Polite	行かないんでしたっけ ikanaindeshita kke	❌ 行きませんっけ ikimasen kke

To sum up

In this article, we focused on か[ka], かな[kana], and っけ[kke], exploring various functions, the most important being…

Asking questions.
Expressing doubt.
Indicating the speaker’s memory is uncertain.

Make sure to read our other articles that will introduce you to more sentence-ending particles to help you speak like a native Japanese speaker. Meanwhile, we have prepared some activities for you to practice か[ka], かな[kana], and っけ[kke]. Happy learning!

To embark on your next language adventure, join Mango on social!

Ready to take the next step?

The Mango Languages learning platform is designed to get you speaking like a local quickly and easily.