Root form فعل

In previous post I said that the root verb is based on the فَعَلَ form. Actually, it is not really فَعَلَ but rather فعل, meaning that only the consonants really matter (as a form). Why is this so? Because the middle consonant in tri-lettered Arabic verbs can be fathah, kasrah or dhammah while the first and last consonants are fathah only. Examples shown below:

Verbs with middle consonant a fathah

1. كَتَبَ to write
2. فَتَحَ to open
3. نَصَرَ to help

Verbs with middle consonant a kasrah

1. فَرِحَ to be happy
2. عَلِمَ to know
3. سَمِعَ to hear

Verbs with middle consonant a dhammah

1. شَرُفَ to be noble
2. كَرُمَ to be generous
3. عَظُمَ to be great