かい means yes/no question ending. It is a JLPT N4 Japanese grammar pattern used to turn a sentence into a casual yes/no question.
This grammar point often appears in conversation, written explanations, formal notices, and JLPT-style reading questions. If you want to turn a sentence into a casual yes/no question, かい is a useful pattern to learn after the N5 basics.
What does かい mean?
Use かい when you want to turn a sentence into a casual yes/no question.
Natural translations include:
- yes/no question ending
- yes/no question ending
- yes/no question ending
The exact English translation changes with context. Focus on what the grammar point does in the sentence first, then choose the English phrase that sounds natural.
How to form かい
Plain sentence + かい
Examples of the pattern:
- 行くかい
- 元気かい
- できるかい
Pay attention to the word form before the pattern. Many JLPT N4 mistakes happen because the meaning is understood, but the grammar is attached to the wrong form.
When is かい used?
Use かい in situations like:
- explaining a condition, reason, decision, or time relationship
- making a sentence more specific than a basic N5 pattern
- understanding natural Japanese in conversation or reading
Tone and register:
- neutral unless the grammar itself is marked as casual, humble, honorific, or formal
- Common in daily speech, textbook examples, and JLPT N4 reading questions
かい example sentences
- 元気かい。 — Are you well?
- 明日行くかい。 — Are you going tomorrow?
- これは君の本かい。 — Is this your book?
- もう食べたかい。 — Have you eaten yet?
- 一人でできるかい。 — Can you do it alone?
Read the Japanese sentence first, then check the English translation. Try to notice what the grammar point contributes: condition, timing, limitation, possibility, decision, politeness, or emphasis.
Nuance of かい
The key nuance is is a casual question ending often used by older men or to children.
This matters because かい may look simple in English, but the Japanese form tells you whether the speaker is describing a time, a condition, a decision, a possibility, or a social relationship.
For example:
- In context, かい helps make the sentence more precise than a direct English translation.
- Compared with か, it has a different focus even when both patterns appear in similar sentences.
かい vs か
Both {jp} and {similar} can appear in related sentences, but they are different.
かい:
- is the target JLPT N4 pattern in this lesson
- carries the specific nuance explained above
か:
- is useful for comparison because learners often mix it up
- may use a different form, tone, or sentence focus
Quick contrast examples:
- Target pattern: 元気かい。 — Are you well?
- Related pattern with か: compare the form and ask whether the sentence is about timing, condition, ability, decision, or politeness.
If you are unsure which one to use, identify the main job of the sentence before translating it into English.
Common mistakes with かい
Watch out for these mistakes:
- Using it with the wrong verb, noun, or adjective form
- Confusing it with か because the English translation can look similar
- Translating it too literally instead of reading the whole sentence context
A good study habit is to write one short sentence and then change only the grammar point. This makes the difference between similar patterns easier to feel.
Is かい on the JLPT?
Yes. かい is commonly taught as JLPT N4 grammar.
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, do not only memorize the English gloss. Practice identifying the words around the grammar point, because JLPT questions often test structure and context together.
Practice questions for かい
Try making your own sentences with these prompts:
- Write one sentence using the basic pattern.
- Change the sentence into polite or casual style if possible.
- Compare it with the related pattern from the comparison section.
Keep the sentences short at first. Once the form feels natural, add time words, places, reasons, or contrast to make the sentence more realistic.
Learn かい with Kanjiru
If you want to review かい together with kanji, vocabulary, and other JLPT N4 patterns, Kanjiru helps you practice Japanese in short, focused sessions.
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