The oblique singular is the form of a singular noun phrase used before a postposition. Its clearest noun ending appears with masculine -ā nouns: direct लड़का laṛkā becomes oblique लड़के laṛke in लड़के से laṛke se. Most other singular nouns do not change their own shape, but they are still grammatically oblique before a postposition.
English puts a preposition before an unchanged noun: in the room. Hindi normally puts a postposition after a case-marked noun phrase: कमरे में kamre meṃ. The oblique ending prepares the phrase to receive the relational word; the postposition expresses the specific relation.
The overt masculine -ā change
Productive masculine class I nouns replace final -ā with -e in the oblique singular.
| Direct singular | Oblique singular | With a postposition |
|---|---|---|
| लड़का laṛkā | लड़के laṛke | लड़के को laṛke ko |
| कमरा kamrā | कमरे kamre | कमरे में kamre meṃ |
| बेटा beṭā | बेटे beṭe | बेटे से beṭe se |
| रास्ता rāstā | रास्ते rāste | रास्ते पर rāste par |
बड़ा कमरा आज खाली है।
baṛā kamrā āj khālī hai.
The large room is empty today.
बड़े कमरे में आज कोई नहीं है।
baṛe kamre meṃ āj koī nahīṃ hai.
There is no one in the large room today.
The postposition changes the whole noun phrase, not only the last word. Direct masculine बड़ा कमरा baṛā kamrā becomes oblique बड़े कमरे baṛe kamre. Demonstratives and possessives show the same case environment: यह कमरा yah kamrā but इस कमरे में is kamre meṃ; मेरा बेटा merā beṭā but मेरे बेटे से mere beṭe se.
मेरे बेटे से शाम को बात कर लेना।
mere beṭe se śām ko bāt kar lenā.
Talk to my son in the evening.
Most other singular nouns look unchanged
Masculine class II nouns and the major feminine classes normally have identical direct and oblique singular noun forms.
| Class | Direct singular | Oblique singular phrase |
|---|---|---|
| masculine invariant | दोस्त dost | दोस्त से dost se |
| masculine -ī | आदमी ādmī | आदमी को ādmī ko |
| feminine -ī | लड़की laṛkī | लड़की से laṛkī se |
| feminine consonant-final | किताब kitāb | किताब में kitāb meṃ |
| feminine -iyā | चिड़िया ciṛiyā | चिड़िया के पास ciṛiyā ke pās |
| feminine -ā | समस्या samasyā | समस्या पर samasyā par |
An unchanged form is not a direct form accidentally placed before a postposition. It is an oblique singular whose declension simply has no overt singular case ending.
यह लड़की मेरी पड़ोसी है।
yah laṛkī merī paṛosī hai.
This girl is my neighbor.
इस लड़की से मेरी कल ही मुलाक़ात हुई।
is laṛkī se merī kal hī mulāqāt huī.
I met this girl only yesterday.
The noun लड़की remains unchanged, but यह yah becomes oblique इस is. This visible change confirms that the complete phrase is oblique. With no modifier, only the following postposition may reveal the case.
किताब मेज़ पर है, लेकिन किताब में मेरा नाम नहीं है।
kitāb mez par hai, lekin kitāb meṃ merā nām nahīṃ hai.
The book is on the table, but my name isn't in the book.
Both occurrences of किताब look alike. The first is direct as the subject; the second is oblique before में.
Invariant loans still enter the case system
Masculine consonant-final loans generally remain unchanged in the singular: होटल hoṭal → होटल में hoṭal meṃ, फ़ोन fon → फ़ोन पर fon par. Hindi does not need to invent a new ending merely to make oblique case audible.
होटल समुद्र के पास है, और होटल में नाश्ता मुफ़्त है।
hoṭal samudra ke pās hai, aur hoṭal meṃ nāśtā muft hai.
The hotel is near the sea, and breakfast is free at the hotel.
The first होटल is direct; the second is oblique. The two forms are morphologically identical, but their syntax is not.
One form can represent several cells
For a class I masculine noun, लड़के laṛke can be direct plural, oblique singular, or singular vocative. Context resolves the form:
| Use | Example | Signal |
|---|---|---|
| direct plural | लड़के आए laṛke āe | plural agreement |
| oblique singular | लड़के से laṛke se | following postposition |
| vocative singular | लड़के! laṛke! | direct address and intonation |
लड़के आए, लेकिन मैं उस लड़के से अभी नहीं मिला।
laṛke āe, lekin maĩ us laṛke se abhī nahīṃ milā.
The boys came, but I haven't met that boy yet.
The first लड़के is direct plural; उस लड़के से is oblique singular. This overlap is regular, not ambiguity in the grammar.
Oblique case is relational scaffolding
The oblique ending alone does not mean “to,” “from,” “in,” or “with.” Those meanings come from the postposition. The same singular form can precede many relational markers:
रवि अपने कमरे में है; मैं उसके कमरे तक जाकर देखता हूँ।
ravi apne kamre meṃ hai; maĩ uske kamre tak jākar dekhtā hū̃.
Ravi is in his room; I'll go as far as his room and check.
Both अपने कमरे and उसके कमरे contain oblique कमरे, but में and तक express different relations. The postposition overview explains their meanings and government; the case rule is constant.
A natural exchange
तुम किस कमरे में बैठोगे? — उस छोटे कमरे में, खिड़की के पास।
tum kis kamre meṃ baiṭhoge? — us choṭe kamre meṃ, khiṛkī ke pās.
Which room will you sit in? — In that small room, near the window.
The question and answer both use oblique masculine कमरे. In उस छोटे कमरे, the demonstrative, adjective, and noun all reflect the same oblique singular environment.
Common Mistakes
1. Keeping masculine -ā before a postposition
❌ मैं लड़का से बात कर रहा हूँ।
Incorrect: masculine लड़का must become oblique लड़के before से.
✅ मैं लड़के से बात कर रहा हूँ।
maĩ laṛke se bāt kar rahā hū̃.
I'm talking to the boy.
2. Changing the noun but not its agreeing adjective
❌ बड़े कमरा में बैठक होगी।
Incorrect: both adjective and noun must be oblique.
✅ बड़े कमरे में बैठक होगी।
baṛe kamre meṃ baiṭhak hogī.
The meeting will be in the large room.
3. Inventing an oblique ending on a feminine singular
❌ मैं लड़कीे से कल मिला।
Incorrect: feminine लड़की remains unchanged in the oblique singular.
✅ मैं लड़की से कल मिला।
maĩ laṛkī se kal milā.
I met the girl yesterday.
4. Leaving a demonstrative direct before a postposition
❌ यह किताब में मेरा नाम लिखा है।
Incorrect: यह must become oblique इस before में.
✅ इस किताब में मेरा नाम लिखा है।
is kitāb meṃ merā nām likhā hai.
My name is written in this book.
Key Takeaways
- Masculine class I -ā becomes -e in the oblique singular.
- Most other noun classes have an unchanged oblique singular.
- Modifiers such as इस, उस, मेरे, and masculine adjectives can make an otherwise hidden case contrast visible.
- The oblique form marks a postpositional environment; the postposition supplies the relation.
- Direct plural, oblique singular, and vocative may share a surface form, so read the entire phrase.
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- Masculine class I nouns in -āA2 — Learn the productive -ā/-e/-oṃ declension of Hindi masculine nouns across direct, oblique, and vocative forms.
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- Oblique plural formationA2 — Build the plural noun forms required before postpositions across the major Hindi declension classes.
- The oblique before simple postpositionsA2 — Apply oblique case consistently to complete noun phrases before simple Hindi postpositions such as को, ने, से, में, पर, and तक.
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