कोई koī introduces an unidentified person or one nonspecific member of a countable class: “someone, anyone, some.” कुछ kuch introduces an unspecified amount, content, set, or degree: “something, some, a little.” The contrast is not simply human versus nonhuman: कोई किताब means “some book,” while कुछ किताबें means “some books.” Compare the negative patterns on the negative-indefinites page.
Core distribution
| Form | Pronoun use | Modifier use |
|---|---|---|
| कोई | someone/anyone | कोई आदमी, कोई किताब |
| कुछ | something/some amount | कुछ पानी, कुछ लोग |
| किसी | oblique of कोई | किसी व्यक्ति से |
| कुछ | usually unchanged | कुछ लोगों से |
बाहर कोई आपका इंतज़ार कर रहा है।
bāhar koī āpkā intazār kar rahā hai.
Someone is waiting for you outside. (respectful reference to addressee)
मुझे कुछ पूछना है।
mujhe kuch pūchnā hai.
I want to ask something.
हमने कुछ फल लिए और कोई अच्छी-सी मिठाई भी ख़रीदी।
hamne kuch phal lie aur koī acchī-sī miṭhāī bhī xarīdī.
We got some fruit and also bought a nice sweet.
कोई as a pronoun and determiner
क्या यहाँ कोई हिंदी बोलता है?
kyā yahā̃ koī hindī boltā hai?
Does anyone here speak Hindi?
कोई रास्ता ज़रूर होगा।
koī rāstā zarūr hogā.
There must be some way.
In questions and possibilities, कोई often corresponds to English any. In affirmative statements it is usually someone/some. Negation determines whether it falls under “no/not any.”
कुछ as quantity and degree
क्या थोड़ा और पानी है? — हाँ, कुछ बचा है।
kyā thoṛā aur pānī hai? — hā̃, kuch bacā hai.
Is there a little more water? — Yes, some is left.
कुछ छात्र जल्दी चले गए।
kuch chātr jaldī cale gae.
Some students left early.
आज मौसम कुछ ठंडा है।
āj mausam kuch ṭhaṇḍā hai.
The weather is somewhat cold today.
Before an adjective, कुछ can mean “somewhat,” an abstract degree rather than a thing.
Oblique किसी
Before postpositions, indefinite कोई normally becomes किसी.
मैंने किसी से इस बारे में बात नहीं की।
maĩne kisī se is bāre meṃ bāt nahīṃ kī.
I did not speak to anyone about this.
यह फ़ाइल किसी के पास होगी।
yah fāil kisī ke pās hogī.
Someone must have this file.
कुछ itself normally remains unchanged, while its following plural noun becomes oblique: कुछ लोगों से, कुछ किताबों में.
Agreement
Pronoun कोई generally takes singular agreement when the referent is unknown.
कोई आया है, लेकिन मुझे नहीं पता कौन।
koī āyā hai, lekin mujhe nahīṃ patā kaun.
Someone has arrived, but I don't know who.
With कुछ + plural noun, the plural noun controls agreement: कुछ महिलाएँ आई हैं. Honorificity can override default expectations when context identifies a respected person, but an entirely unknown कोई normally begins with default masculine singular.
Formal and informal minimal pair
क्या तुम्हें कुछ चाहिए?
kyā tumheṃ kuch cāhie?
Do you need anything? (familiar)
क्या आपको कुछ चाहिए?
kyā āpko kuch cāhie?
Do you need anything? (respectful)
The indefinite stays unchanged; तुम्हें/आपको marks the relationship.
A natural dialogue
क्या कोई आपसे मिलने आया था? — हाँ, कोई बुज़ुर्ग सज्जन आए थे।
kyā koī āpse milne āyā thā? — hā̃, koī buzurg sajjan āe the.
Did someone come to see you? — Yes, an elderly gentleman came. (respectful third-person reference)
Common Mistakes
1. Using कुछ for one unidentified person
❌ बाहर कुछ आपका इंतज़ार कर रहा है।
Incorrect for “someone”: use कोई.
✅ बाहर कोई मेहमान आपका इंतज़ार कर रहा है।
bāhar koī mehmān āpkā intazār kar rahā hai.
Some guest is waiting for you outside.
2. Keeping कोई before a postposition
❌ मैंने कोई से बात की।
Incorrect: कोई becomes किसी before से.
✅ मैंने किसी से बात की।
maĩne kisī se bāt kī.
I spoke with someone.
3. Using singular agreement with a plural noun
❌ कुछ लड़कियाँ बाहर बैठी है।
Incorrect: plural लड़कियाँ takes plural हैं.
✅ कुछ लड़कियाँ बाहर बैठी हैं।
kuch laṛkiyā̃ bāhar baiṭhī haiṃ.
Some girls are sitting outside.
4. Using intimate तुझे by default
❌ सर, तुझे कुछ चाहिए?
Inappropriate default: use respectful आपको with an unfamiliar adult.
✅ सर, आपको कुछ चाहिए?
sar, āpko kuch cāhie?
Sir, do you need anything?
Free choice and approximation
With भी, कोई भी can mean “any one at all” in a positive permission.
आप कोई भी सीट चुन सकते हैं।
āp koī bhī sīṭ cun sakte haiṃ.
You may choose any seat. (respectful, to a man or mixed group)
Reduplicated कुछ-कुछ means “somewhat/in some respects.”
दोनों सुझाव कुछ-कुछ एक जैसे हैं।
donoṃ sujhāv kuch-kuch ek jaise haiṃ.
The two suggestions are somewhat alike.
Before a numeral, conversational कोई can approximate an amount.
काम पूरा होने में कोई दो घंटे लगेंगे।
kām pūrā hone meṃ koī do ghaṇṭe lageṅge.
The work will take about two hours.
These extensions are systematic but not interchangeable: free-choice कोई भी, degree कुछ-कुछ, and approximate कोई दो each have their own construction.
Key Takeaways
Neither indefinite inherently marks respect. If कोई is later identified as a respected individual, subsequent reference can shift to honorific वे/उन्होंने/उन्हें with plural agreement. The initial unknown referent and the later socially identified person occupy different discourse stages.
- कोई selects an unidentified person or countable member; कुछ gives unspecified content, quantity, plurality, or degree.
- Before postpositions, कोई → किसी.
- कुछ remains unchanged, but a following noun takes required case and agreement.
- Questions and negation often translate कोई/कुछ as English any.
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- Negative indefinites कोई नहीं and कुछ नहींB1 — Express nobody, nothing, and not any with कोई नहीं, कुछ नहीं, किसी…नहीं, while controlling scope, case, agreement, and emphatic भी.
- Scope with negation and quantifiersC1 — Interpret and disambiguate not all, none, some not, free-choice any, and same-versus-varying readings in Hindi quantified clauses.
- Oblique किस and किनB1 — Use singular/general किस and selected-plural किन before postpositions, in possessives, and in conventional किसे/किन्हें and किसने/किन्होंने forms.
- Pronouns with कोA2 — Use the conventional को-series मुझे, तुझे, तुम्हें, आपको, इसे, उसे, इन्हें, and उन्हें for objects, recipients, and experiencers.
- Distributive जो कोई and हर कोईB1 — Distinguish universal हर कोई from free relative जो कोई, including हर किसी, जिस किसी, singular distributive agreement, and reflexive अपना.