Is are pehle kab aata h

jab kisi se question puchna hota hai. . .

Jab sentence interrogative ho ya negative interrogative sentence ho.

While framing an interrogative sentence in present tense, we use "is/am/are" in the starting of the sentence. For ex:- Is he really poor? It doesn't seem by seeing him. Are you going there today?

When the sentence is Interrogative we should use "is" or "are" before the sentence. Ex :- Is she going to market ? Are they studying now ?