For time, ask “when?” or “for how long?”; for place, ask “where?”.
صُمْتُ دَهْرًا — for a long period.
جَلَسْتُ خَلْفَكَ — behind you.
Both phrases come from the book. They locate the action, rather than naming a direct object affected by it.
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Identifying an Adverbial
Al-Mafʿūl Fīhi: Adverbials of Time and Place
For time, ask “when?” or “for how long?”; for place, ask “where?”.
صُمْتُ دَهْرًا — for a long period.
جَلَسْتُ خَلْفَكَ — behind you.
Both phrases come from the book. They locate the action, rather than naming a direct object affected by it.