اسْتَغْفِرْ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – اسْتَغْفِرْ is a verb

A verb will either be 1) past tense or 2) present or future tense or 3) a command or request verb, also called an imperative – اسْتَغْفِرْ is a command verb

Seek or ask for protection and/or forgiveness

To cover, hide, conceal, forgive, give protection, set the affairs right, supress the defect

  Grammatical analysis of اسْتَغْفِرْ
 فِعْلُ أَمْرٍ مَبْنِيٌّ عَلِى السُّكُوْنِ  
 فَاعِلُهُ ضَمِيْرٌ مُسْتَتِرٌ تَقْدِيْرُهُ أَنْتَ
 

مُتَقَلِّمٌ أَنْتَاِسْمُ الْمَفْعُوْلِاِسْمُ الْفَاعِلِغ ف راِسْتَغْفَرَ يَسْتَغْفِرُبَابٌ اِسْتِفْعَالٌ
Subject YouPassive ParticipleActive participleRootForm 10اَلْمَصْدَرُ
 مُسْتَغْفَرٌ مُسْتَغْفِرٌفِعْلٌاِسْتِغْفَارٌ
    
Verb of command Requestفِعْلُ أَمْرٍPresent and future tense verbفِعْلٌ مُضَارِعٌPast tense verbفِعْلٌ مَاضٍ
He seeks forgivenessيَسْتَغْفِرُHe sought forgivenessاِسْتَغْفَرَ
They two seek forgivenessيَسْتَغْفِرَانِThey two sought forgivenessاِسْتَغْفَرَا
They seek forgivenessيَسْتَغْفِرُوْنَThey sought forgivenessاِسْتَغْفَرُوْا
She seeks forgivenessتَسْتَغْفِرُShe sought forgivenessاِسْتَغْفَرَتْ
They two (feminine) seek forgivenessتَسْتَغْفِرَانِThey two (feminine) sought forgivenessاِسْتَغْفَرَتَا
They (feminine) seek forgivenessيَسْتَغْفِرْنَThey (feminine) sought forgivenessاِسْتَغْفَرْنَ
Seek/ask forgiveness, protectionاسْتَغْفِرْYou seek forgivenessتَسْتَغْفِرُYou sought forgivenessاِسْتَغْفَرْتَ
Seek forgiveness (You two)اِسْتَغْفِرَاYou two seek forgivenessتَسْتَغْفِرَانِYou two sought forgivenessاِسْتَغْفَرْتُمَا
Seek forgiveness (You all)اسْتَغْفِرُوْاYou all seek forgivenessتَسْتَغْفِرُوْنَYou all sought forgivenessاِسْتَغْفَرْتُمْ
Seek forgiveness (feminine)اسْتَغْفِرِيْYou (feminine) seek forgivenessتَسْتَغْفِرِيْنَYou (feminine) sought forgivenessاِسْتَغْفَرْتِ
Seek forgiveness (You two feminine)اسْتَغْفِرَاYou two (feminine) seek forgivenessتَسْتَغْفِرَانِYou two (feminine) sought forgivenessاِسْتَغْفَرْتُمَا
Seek forgiveness (You all feminine)اسْتَغْفِرْنَYou all (feminine) seek forgivenessتَسْتَغْفِرْنَYou all (feminine) sought forgivenessاِسْتَغْفَرْتُنَّ
I seek forgivenessأَسْتَغْفِرُI sought forgivenessاِسْتَغْفَرْتُ
We seek forgivenessنَسْتَغْفِرُWe sought forgivenessاِسْتَغْفَرْنَا

Surah/Below are the 10 verses in the holy Quran containing the derived, form 10, second person, masculine, imperative verbاسْتَغْفِرْ
Verse
so, by that mercy from Allah (SWT) you dealt gently with themفَبِمَا رَحْمَةٍ مِّنَ اللهِ لِنْتَ لَهُمْ
and had you been rude and harsh hearted surely, they would disperse from around youوَلَوْ كُنْتَ فَظًّا غَلِيْظَ القَلْبِ لَانْفَضُّوا مِنْ حَوْلِكَ
then pardon them and ask forgiveness for them and consult them in the matterفَاعْفُ عَنْهُمْ وَاسْتَغْفِرْ لَهُمْ وَشَاوِرْهُمْ فِيْ الأَمْرِ
then when you have decided then place your trust in Allah (SWT)فَإِذَا عَزَمْتَ فَتَوَكَّلْ عَلَى اللهِ
3-159Surely, Allah (SWT) loves the ones who place trust (in Him)إِنَّ اللهَ يُحِبُّ المُتَوَكِّلِيْنَ
4-106and seek forgiveness of Allah (SWT) truly Allah (SWT) is Oft-Forgiving, Most-Mercfifulوَاسْتَغْفِرِ اللهَ إِنَّ اللهَ كَانَ غَفُوْرًا رَّحِيْمًا
Ask forgiveness for them or don’t ask forgiveness for them, if you ask forgiveness for them seventy timesاسْتَغْفِرْ لَهُمْ أَوْ لَا تَسْتَغْفِرْ لَهُمْ إِنْ تَسْتَغْفِرْ لَهُمْ سَبْعِيْنَ مَرَّةً
not will Allah (SWT) forgive them, that is because they disbelieved in Allah (SWT) and His Messengerفَلَن يَغْفِرَ اللهُ لَهُمْ ذَلِكَ بِأَنَّهُمْ كَفَرُوا بِاللهِ وَرَسُوْلِهِ
9-80and Allah (SWT) does not guide the defiantly disobedient peopleوَاللهُ لَا يَهْدِي القَوْمَ الفَاسِقِيْنَ
12-97
12-97
24-62
40-55
47-19
48-11
60-12
110-3Then glorify the praises of your Nurturer and seek His forgiveness, truly He is oft returningفَسَبِّحْ بِحَمْدِ رَبِّكَ وَاسْتَغْفِرْهُ إِنَّهُ كَانَ تَوَّابًا