أَخُوكَ قَادِمٌ
Your brother is coming.
إِنَّ أَخَاكَ قَادِمٌ
Indeed, your brother is coming.
The first suits a listener without a prior view. The second adds the particle inna to address hesitation. Strong denial may warrant stronger emphasis, but piling up emphatic particles indiscriminately is not eloquence. The amount of emphasis must match the listener's state.
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Supplementary Applied Practice — Maʿānī, Bayān and Badīʿ
أَخُوكَ قَادِمٌ
Your brother is coming.
إِنَّ أَخَاكَ قَادِمٌ
Indeed, your brother is coming.
The first suits a listener without a prior view. The second adds the particle inna to address hesitation. Strong denial may warrant stronger emphasis, but piling up emphatic particles indiscriminately is not eloquence. The amount of emphasis must match the listener's state.