Negating the Past with (لم)
To formally say that an action "did not" happen in Modern Standard Arabic, use the negative particle لم.
| did not | لمlam |
Here is the crucial rule: لم is always followed by a verb in the present tense. Even though the verb form is present, the particle لم shifts the entire meaning of the sentence into the past.
The Jussive Mood After (لم)
The present tense verb following لم must be in the Jussive mood (المضارع المجزوم). For regular verbs, this means dropping the final short vowel, which leaves the final consonant vowelless (indicated by a sukun).
| Why did the employee not bring a clean towel? | لماذا لم يحضر الموظف منشفة نظيفة؟limâdhâ lam yuhdiri-l-muwazzafu minshafatan nazîfatan؟ |
| The hotel service is poor, and I did not find soap. | خدمة الفندق ضعيفة، ولم أجد صابونا.khidmatu alfunduqi da'îfah, walam ajid sâbûnan. |
Hollow and Doubled Verbs in the Jussive
Because the Jussive mood usually places a sukun on the final consonant, it affects "hollow" verbs (verbs with a long vowel in the middle). To prevent two vowelless letters from sitting right next to each other, the middle long vowel is dropped.
Notice how أنام (I sleep) drops its middle vowel to become أنم:
| The air conditioner did not work, so I did not sleep. | المكيف لم يعمل، فلم أنم.al-mukayyifu lam ya'mal, falam anam. |
Similarly, doubled verbs (verbs with a repeated root letter at the end) adapt to the Jussive mood. Watch how يرد (to reply) is used below:
| I sent a message to the manager, but no one replied. | أرسلت رسالة إلى المدير، لكن لم يرد أحد.arsaltu risâlatan ilâ al-mudîri, lakin lam yarudda ahad. |
Attaching Object Pronouns
When you need to specify the object of your negated verb (e.g., "did not bring it"), the object pronoun attaches directly to the end of the verb. The Jussive rules still apply to the verb itself before the pronoun is added.
| I requested a towel, but he did not bring it. | طلبت منشفة لكنه لم يحضرها.talabtu minshafatan lakinnahu lam yuhdirha |
| Did you change the room? No, I did not change it because the manager did not reply. | هل غيرت الغرفة؟ لا، لم أغيرها لأن المدير لم يرد.hal ghayyarta al-ghurfata? lâ, lam ughayyirhâ li'anna al-mudîra lam yarudda. |
Seeing the endings
After لم a regular verb loses its final vowel. Without vowel marks you cannot see the change, only hear it:
| present | after لم |
|---|---|
| يَعْمَلُ | لَمْ يَعْمَلْ |
| أَجِدُ | لَمْ أَجِدْ |
| يُحْضِرُ | لَمْ يُحْضِرْ |
Before ال the sukun becomes a linking -i: لَمْ يُحْضِرِ الْمُوَظَّفُ. The hollow verbs are the exception you can see: أَنَامُ becomes لَمْ أَنَمْ, with the long vowel gone from the spelling.
