Al-nahy literally requests refraining from an action with an authoritative stance. Its standard syntax is prohibitive lā + jussive imperfect.
Literal ban: “Wa-lā tufsidū fī al-arḍ” — a genuine prohibition.
Duʿāʾ: “Fa-lā tushmit biya al-aʿdāʾ” — humble appeal.
Iltimās: “Lā tabraḥ min makānika” — a peer’s request.
Tamannī: “Yā ṣubḥu qif lā taṭluʿ” — yearning for a desired outcome.
Tahdīd: “Lā tuṭiʿ amrī” — warning about the consequences of disobedience.
The decisive distinction is not the shared form but the speaker’s intention and situational appropriateness. The next topic is al-istifhām, the question form and its rhetorical uses.