Result fāʾ may be followed by a subjunctive under understood an after command, prohibition, question, negation, wish or gentle invitation. An ordinary conjunction does not automatically have this effect.
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Category 4: Result Fāʾ
The Subjunctive Imperfect and Its Governors
Result fāʾ may be followed by a subjunctive under understood an after command, prohibition, question, negation, wish or gentle invitation. An ordinary conjunction does not automatically have this effect.