(20:114) وقُلْ ربِّ زِدْنِي عِلْماً
منادى مضاف لياء المتكلم المحذوفه
Evocation (Calling out, hidden “oh”)
Rabb is connected to pronoun “my” (which has been dropped) to form “my lord”.
The “my” pronoun can be dropped because nasb pronouns are allowed to be omitted. The indication of the drop is with the kasra on "ب"
second person command verb (active)
the object of the verb is the rest of the sentence
وعملا ً مفعول به ثان
فعل امر والنون للوقاية
والياء مفعول به اوٌل
Second object to the command verb
تميز is a noun that removes the ambiguity or
Command verb (Active)
The “nun” is the “nun” of protection (because it protects the end of the word from any change. It doesn’t hold any meaning)
Meaning: and say: My Lord! Increase me in knowledge.
Source: Irab-ul-Quran - Muhuddin Darwish