Persian Grammar
Learn About Persian Language

In Persian, you can convert an adjective to a noun by suffixing ی (-i) to the adjective. This suffix changes to -gi when the adjective ends in the vowel -e and to -yi after other vowels.

AdjectiveNoun
خوب
khub
good
خوبی
khubi
goodness
بد
bad
bad
بدی
badi
badness
زیبا
zibâ
beautiful
زیبایی
zibâyi
beauty
تازه
tâze
fresh
تازگی
tâzegi
freshness

Therefore, خوبی (goodness) is the nominal form of خوب (good), تازگی (freshness) is the nominal form of تازه (fresh) and so on.

Equality structure

To make a comparison of equality e.g. “as good as”, we put the nominal form the adjective in the following structure:

Since the nominal form always ends in the vowel i, the preposition -e always appears as -ye in the above structure.

Examples

به خوبی
be khubi-ye
as good as
به بدی
be badi-ye
as bad as
به زیبایی
be zibâyi-ye
as beautiful as
به تازگی
be tâzegi-ye
as fresh as

So, for example, به زیبایی (be zibâyi-ye) literally means: to the beauty of.

Equaling A and B

To say A and B are equal, we use the following structure:

Aequality structureB

Example

سارا به زیبایی خواهرش است
Sârâ be zibâyi-ye khwâhar-ash ast
Sarah is as beautiful as her sister

Literally, it is like saying: Sarah['s beauty] is [equal] to the beauty of her sister.