If the indefinite suffix ی is used on a word that ends in ی, an ا or ی is often inserted between the word and the suffix:
"a chair" چوکی ای or چوکی یی
When the indefinite suffix is added to words ending in ا or و, it is written یی or ئی:
"a desert" صحرایی
"a hair" موئی
The two forms are used interchangeably.
When the indefinite suffix is added to words ending in ه or ﻪ (final a), it is generally written ای:
"a boy" بچه ای
"a house" خانه ای
Note: Words ending in ه (consonant) take the indefinite suffix in the usual way:
"a way" راهی
"a village" دهی
A noun qualified by the interrogative adjective چه "what?" usually takes the indefinite suffix:
"What man?" چه کسی
"What books?" چه کتابهایی
See Also: