وَصَلَ الضَّيْفُ لَيْلًا.
The guest arrived at night.
When the time of arrival matters and the unqualified sentence invites no particular misconception, 'laylan' adds useful detail. It completes the communicative aim, but need not be iḥtirās.
Iḥtirās blocks an unintended reading; tatmīm adds relevant information without such a danger. The same phrase may be classified differently when the audience's needs change.
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Supplementary Practice 2: Editing Rhetorical Expression, Context and Reasoning
وَصَلَ الضَّيْفُ لَيْلًا.
The guest arrived at night.
When the time of arrival matters and the unqualified sentence invites no particular misconception, 'laylan' adds useful detail. It completes the communicative aim, but need not be iḥtirās.
Iḥtirās blocks an unintended reading; tatmīm adds relevant information without such a danger. The same phrase may be classified differently when the audience's needs change.