The words above belong to a category of five words called الأَسْمَاءُ الْخَمْسَةُ(we will learn the remaining three in later lessons In-Shā’-Allâh). When we want to say "Your book" in Arabic we say كِتَابُكَ but when we want to say "your father", it would be written as أَبُوكَand not أَبُكَ. Similar is the case with the word "brother" when a pronoun is added to it, a letter 'wāw' is added as a second last letter and hence the word will become أَخُوكَinstead of أَخُكَ.
When any of these words annexed with pronouns appear in the nominative case (we will learn more about this later), the letter "wāw" is added as the penultimate (second to last) letter i.e., هَـٰذَا أَبُوكَor ذََلِكَ أَخُوكَ but when they appear in genitive case (we will learn more about this later) the letter 'ya’' is added instead of 'wāw' and the word thus formed is أَبِيكَ or أَخِيكَ.
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Learn Arabic Alphabet
This video teaches you how each Arabic letter is written and pronounced along with an illustration of a word using that letter and guides on pronunciation.
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