Please help me correct my sentence

Please help me correct my sentence

Please help me correct this sentence.
Show the mistakes and give the correction (right answer) with the translation.

I'd like to the which one is fiil, fail, manshub, majrur, ect.

١. لَنْ نَفْهَمَ النَّحْوَ حَتَّى نَتَعَلَّمُ بإجتهاد

<em>We'll never understand grammar until we learn diligently.</em>

٢. تَزورُ فَاطِمَةُ عَائِشَةَ يَوْمَ الأَحَدِ لِتُعَلِّمَها

<em>Fatima visits Aisha on Sunday to teach her.</em>

3. لَمْ يذْهَبْ الطلاب إِلَى المَيْدَانِ بسبب هطول المطر

<em>The students didn't go to the field/ square because it was raining.</em>

4. إِنْ تَسْتَغْفِرُوْا يَغْفِرُ اللّٰهُ لَكُمْ ذُنُوْبَكُمْ

If you asked Allah for forgiveness, he would forgive your sins.

٥. عُيِّن الإِمَامُ لِيُتبَع

<em>The imam was assigned to be followed.</em>

Thanks in advance!