The imperative form can perform supplication

Supplementary Practice 6: Rhetorical Dialogue, Responding to Objections and Choosing the Right Expression

رَبِّ اغْفِرْ لِي.
My Lord, forgive me.

The verb ighfir has an imperative morphological form, but a servant addressing the Lord performs supplication (duʿāʾ), not a superior's command. Morphological category and rhetorical speech act must be separated.

اُكْتُبْ جَوَابَكَ.
Write your answer.

An instructor addressing a student can use the same general imperative shape as a straightforward direction. Similar verb morphology does not entail identical communicative force.