"What will you do in Delhi?"
Translation:आप दिल्ली में क्या करेंगे?
I'm a little confused on the verb tense. Is karenge in oblique form here or is this the spelling always used for third person? If it is oblique, why?
As far as I understand, verbs do not take the oblique form - only nouns do. Here, Delhi would be the noun taking the oblique, as it is followed by the post position Mein. Karenge is in the respectful third person future tense - with the एगें ending