Usages of لم
إذا لم تفهمي السؤال، اسألي الأستاذة بعد الدرس.
If you did not understand the question, ask the professor after the lesson.
لم أجد رقم الغرفة في الرسالة، لذلك ذهبت إلى الشركة مبكرا.
I did not find the room number in the message, so I went to the company early.
ذهبت إلى المركز اليوم، لكنه لم يكن مفتوحا في الساعة التاسعة.
I went to the center today, but it was not open at nine o’clock.
إذا لم تجدي مساعدة في المكتب، اتصلي بي.
If you do not find help in the office, call me.
لم أفهم سبب هذا القرار، ثم فهمت الفكرة بعد الاجتماع.
I did not understand the reason for this decision, then I understood the idea after the meeting.
إذا لم أفهم البرنامج، أحتاج إلى مساعدة.
If I do not understand the program, I need help.
Test yourself: What does لم mean?
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