لَم نَشْرَحْ

لَم نَشْرَحْ is a verbal sentence (الجُمْلَةُ الفِعْلِيَّةُ) consisting of a jussive, past tense negative particle and a jussive, present tense verb

The natural state of the present tense verb is نَشْرَحُ however due to the presence of the jussive particle لَم that precedes it, it changes to نَشْرَحْ

SentenceParticle / VerbVerb Particle
الجُمْلَةُ الفِعْلِيَّةُحَرْفٌ جَزْمٌ وَفِعْلٌ مَجْزُوْمٌفِعْلٌ مُضَارِعٌ مَجْزُوْمٌ بِالسُّكُوْنِ الزَّاهِرَةِحَرْفٌ جَزْمٌ
verbal sentenceSentencea present or future tense jussive verba jussive, past tense, negative particle
  
Did We not expandلَم نَشْرَحْ=نَشْرَحْ+لَم
Did We not expandWe expandnot did
Surah/Below is the only verse in the holy Quran containing the verbal sentenceلَم نَشْرَحْ
Verse
94-1Have We not opened up for you your breast?أَلَمْ نَشْرَحْ لَكَ صَدْرَكَ