
Tooba B. answered 11/23/20
MA in Persian Language and Literature with 20+ of Teaching Experience
The letters in each set do not differ in pronunciation although each letter has a different name and form of writing in Farsi .
( ت ط ) =T -> consider the sound of T in English
(ث س ص ) = S -> consider the sound of S in English
(ز ذ ظ ض ) = Z -> consider the sound of Z in English
(ح ه ) = H -> consider the sound of H in English
These groups of letters come from the words entered into Farsi from other languages such as Arabic; or the ancient words come from Pahlavi and Avestan which are changed in pronunciation over the time.