Arabic uses diacritical marks called Harakaat to represent short vowel sounds. These vowels cannot stand alone, meaning they must be carried by another letter, be it a consonant or a vowel.
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Fatha (بَ) – short "a" sound written as a line placed above the letter /ba/
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Kasra (بِ) – short "i" sound, written as a line below the letter /bi/
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Damma (بُ) – short "u" sound, written as a tiny Waw و above the letter /bu/
In Arabic, short vowels can’t start a word on their own. They must be attached to a letter— but what happens when a word begins with a short vowel sound?
It this case, Arabic uses a special letter — the alif with a hamza (أ) — to carry the short vowel. Since the Alif is just being used as a holder, it doesn’t create any sound, instead it will sound just like the short vowel it holds.