طلب استخدام unless مع جملة if المثبتة شئ غير منطقي علي الاطلاق فلا بد ان تكون جملة if منفية حتي يتثني استخدام unless فتكون الجملة كما يلي
If he hadn't studied hard, he wouldn't have succeeded. (Unless
Unless he had studied hard, he wouldn't have succeeded.
اما اذا اردنا استخدام unless علي هذا الحال فتكون الجملة كما يلي
Unless he had studied carelessly, he would have succeeded
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