Sandhi (संधि) literally means "joining" — it is the process by which two sounds combine at the boundary of words or morphemes to produce a single, phonetically smooth unit. In Hindi grammar, mastering sandhi is essential because MP TET regularly tests candidates on identifying sandhi type, performing sandhi-vichchhed (splitting), and forming sandhi from given components.
Sandhi appears in the Language I (Hindi) section and typically carries 2–4 direct questions. Beyond marks, understanding sandhi improves your reading fluency and helps you decode unfamiliar compound words — a skill useful for unseen passage comprehension as well. The three major categories you must know are Swar Sandhi (vowel + vowel), Vyanjan Sandhi (consonant + vowel/consonant), and Visarg Sandhi (visarg + vowel/consonant).
Key Concepts
**Sandhi = phonetic fusion**: When the last sound of one word meets the first sound of another, both may change to create a new, combined form.
**Sandhi-vichchhed**: The reverse process — breaking a combined word into its original components (e.g., विद्यालय → विद्या + आलय).
**Swar Sandhi**: Occurs when a vowel at the end of one word joins a vowel at the start of the next. Hindi recognises five sub-types: Deergh, Gun, Vriddhi, Yan and Ayaadi.
**Vyanjan Sandhi**: Occurs when a consonant meets a vowel or another consonant. The consonant may change its form or merge (e.g., जगत् + नाथ = जगन्नाथ).
**Visarg Sandhi**: Occurs when a word ending in visarg (ः) joins a vowel or consonant. Visarg may convert to स्, र्, ओ, or disappear entirely depending on what follows.
**Order of learning**: Swar Sandhi rules are most frequent and predictable; Vyanjan rules require memorising specific consonant behaviours; Visarg rules depend on the following sound's class (soft/hard).
**Tatsam bias**: Most sandhi examples come from Sanskrit-origin (tatsam) words; tadbhav words rarely show classical sandhi.
Formulas / Key Facts
### Swar Sandhi — Five Types
| Type | Rule | Example | |------|------|---------| | **Deergh (दीर्घ)** | Same simple vowel + same simple vowel → long vowel (अ/आ + अ/आ = आ; इ/ई + इ/ई = ई; उ/ऊ + उ/ऊ = ऊ) | विद्या + आलय = विद्यालय | | **Gun (गुण)** | अ/आ + इ/ई = ए; अ/आ + उ/ऊ = ओ; अ/आ + ऋ = अर् | देव + इंद्र = देवेंद्र; महा + उत्सव = महोत्सव | | **Vriddhi (वृद्धि)** | अ/आ + ए/ऐ = ऐ; अ/आ + ओ/औ = औ | एक + एक = एकैक; महा + औषध = महौषध | | **Yan (यण्)** | इ/ई + dissimilar vowel = य्; उ/ऊ + dissimilar vowel = व्; ऋ + dissimilar vowel = र् | अति + अधिक = अत्यधिक; अनु + आय = अन्वय | | **Ayaadi (अयादि)** | ए/ऐ/ओ/औ + any vowel → ए→अय्, ऐ→आय्, ओ→अव्, औ→आव् | ने + अन = नयन; पो + अन = पवन |
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### Example 1 — Swar Sandhi (Deergh) **Question**: परम + अर्थ = ?
**Solution**:
Last vowel of परम is अ.
First vowel of अर्थ is अ.
अ + अ = आ (Deergh Sandhi).
Result: **परमार्थ**.
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### Example 2 — Swar Sandhi (Yan) **Question**: Perform sandhi-vichchhed of प्रत्येक.
**Solution**:
Identify य् in the middle — suggests Yan Sandhi.
य् comes from इ/ई + dissimilar vowel.
Break: प्रति + एक.
Verify: इ + ए → य् + ए = ये.
Result: **प्रति + एक**.
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### Example 3 — Visarg Sandhi **Question**: निः + रोग = ?
**Solution**:
Visarg (ः) followed by र (soft consonant).
Rule: Visarg before soft consonant → ओ or र्.
Here visarg + र → visarg becomes ई (special sub-rule for निः before र) → **नीरोग**.
Alternate accepted form: निरोग (visarg → र्, and र् + र coalesce).
(Note: Both forms appear in texts; MP TET typically accepts the more common form given in NCERT-style texts.)
Common Mistakes
1. **Confusing Gun and Vriddhi**: Students apply Gun rule when Vriddhi is needed. *Fix*: Gun involves simple इ/उ/ऋ with अ/आ; Vriddhi involves ए/ऐ/ओ/औ with अ/आ.
2. **Ignoring dissimilar vowel requirement in Yan Sandhi**: Yan Sandhi occurs only when the second vowel is *different* from the first. If both are इ, use Deergh, not Yan.
3. **Forgetting nasal assimilation in Vyanjan Sandhi**: जगत् + ईश = जगदीश (voiced), but जगत् + नाथ = जगन्नाथ (nasal). Students often write जगतनाथ — incorrect.
4. **Treating all visarg words the same**: Visarg outcome depends heavily on what follows. Memorise at least the च/छ → श्, ट/ठ → ष्, त/थ → स् pattern.
5. **Splitting compound words incorrectly**: When performing vichchhed, always verify by re-applying the sandhi rule. If the recombined form doesn't match, your split is wrong.