لَا تَقْهَرْ

لَا تَقْهَرْ 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 تَقْهَرُ however due to the presence of the jussive particle لَا that precedes it, it changes to تَقْهَرْ

SentenceParticle / VerbVerb Particle
الجُمْلَةُ الفِعْلِيَّةُحَرْفٌ جَزْمٌ وَفِعْلٌ مَجْزُوْمٌفِعْلٌ مُضَارِعٌ مَجْزُوْمٌ بِالسُّكُوْنِ الزَّاهِرَةِحَرْفٌ جَزْمٌ
verbal sentenceSentencea present or future tense jussive verba jussive, prohibitive particle
  
Don’t oppressلَا تَقْهَرْ=تَقْهَرْ+لَا
Do not oppressoppressDo not
Surah/Below is the only verse in the holy Quran containing the verbal sentenceلَا تَقْهَرْ
Verse
93-9So as for the orphan, do not oppress (subjugate)فَأَمَّا اليَتِيْمَ فَلَا تَقْهَرْ