sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Islam practiced by ISIS is purest form of islam as practiced by Prophet?
 sentence 2: Is the Islamic state practicing the purest form of Islam as it existed at the time of Muhammad? sentence 1: What is the advantage of Quora compared with Google?
 sentence 2: What is the difference between Google, Facebook and Quora?
not same meaning
same meaning
not same meaning