Taʿajjub expresses astonishment or admiration at an unusual degree of a quality. “How beautiful the garden is!” is exclamation, not a real question.
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What Is an Exclamation?
The Two Exclamatory Verbs: Forms, Rules and Parsing
Taʿajjub expresses astonishment or admiration at an unusual degree of a quality. “How beautiful the garden is!” is exclamation, not a real question.