Abstract
Arabic endeavored to get rid of successive similar letters, due to the
fact that they are difficult to pronounce, using multifarious ways; one
of which was to substitute some of them for either a consonant or a
vowel so as to soften and ease their pronunciation. Substitution
phenomena do not generate adequate resort due to its divergent
localities in Arabic. Because of all of this, this study attempts to
manifest these phenomena.
Not only did I pursue and encompass those phenomena, but I also
tried, as much as I could, to bring out its causes, display Arab
intention of using them and demonstrate Arab linguists‘ attitudes
towards all of this.