sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: How can I know my wife has had an affair?
 sentence 2: How can I know if my wife is a cheater? sentence 1: How can I book more than 7 tickets in irctc?
 sentence 2: How do I cancel my train tickets booked through Paytm for the IRCTC?
not same meaning
same meaning
not same meaning