You can use have been with (I, we and they) and has been with(she,he)

I live in Chennai means mai chennai me rehta hu/rehti hu and I live at chennai means mai chennai ke upar rehta/rehti hu For eg. You can use (at) like keep it at the table and you can use (in) like I was in the car.

Rajasthan is a place in India

I am new to use this app and I don't even know who is naveen. Are you sure naveen is down voting people I got no down votes and if you are sure then how did you find out.

Mine is math and science I guess not sure but I like math more than science.

What do you mean?

Mai kya kar raha hu se muje dar lag raha hai

The god