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I do not see any reason for silent letters in English except for differentiating between words like "write" and "right". For Arabic, there are no silent letters. Actually the first letter in names like الشمس والنور is verbally repeated. The rule is only because of the difficulty to pronounce ال when combined with certain letters: ( ت، ث ،س ،ش، ض، ط، ط" ر، ز ، د، ن