This is an interrogative sentence of Present Indefinite Tense.
Present Indefinite Tense
Active Voice: Subject + Verb + Object
Passive Voice: Object + is/am/are+ third form of a verb + by + subject.
We generally use on after enlarge.
On is a preposition here.
Enlarge on کسی چیز کے بارے میں بہت باتیں کرنا
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