هَذَا إِذَا كَانَ الْمَحْذُوفُ مَنْوِيًّا لِلْمُتَكَلِّمِ، وَإِلَّا لَكَانَتْ مُعْرَبَةً.
Translation: This applies when the speaker intends the omitted complement; otherwise the words are declinable.
The book conditions this construction on an omitted yet intended genitive complement. Not every occurrence of qabl or baʿd is therefore indeclinable.
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Indeclinable Adverbs — Ghāyāt, Time and Place
هَذَا إِذَا كَانَ الْمَحْذُوفُ مَنْوِيًّا لِلْمُتَكَلِّمِ، وَإِلَّا لَكَانَتْ مُعْرَبَةً.
Translation: This applies when the speaker intends the omitted complement; otherwise the words are declinable.
The book conditions this construction on an omitted yet intended genitive complement. Not every occurrence of qabl or baʿd is therefore indeclinable.