No सन्धि takes place when any vowel follows; in the following cases:
- When the dual form of any noun/pronoun/verb ends in ई/ऊ/ए. E.g.1.कवी+एतौ=कवी एतौ। 2.माले+अमू=माले अमू। 3.वायू+इमौ=वायू इमौ।
- When ई/ऊ follows म् of अदस् pronoun in its declension. E.g.1.अमी+ईशाः=अमी ईशाः। 2.अमू+आगते=अमू आगते।
- When a single-vowel-particle :(except आ when it means 'a little, exclusive or inclusive' OR when आ is used as a preposition) is used.E.g. इ इन्द्र। (O इन्द्र!), उ उमेश। (O उमेश!), आ इदम्। (Ah, this!) but आ+उष्णम्=ओष्णम्। (a little warmth).
- When an indeclinable ending in ओ is used.E.g. अहो उत्तमाः। The Vocative case-words optionally combine with इति. E.g.विष्णो+इति= विष्णो इति।OR विष्णविति। OR विष्ण इति।