sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: How do you tell if a boy likes you?
 sentence 2: How do you know if a boy loves you? sentence 1: Was Neil Armstrong a genius?
 sentence 2: What was Neil Armstrong’s I.Q.? sentence 1: What cell providers in the US allow you to log in to an account on their website and check your SMS messages without requiring access to your phone?
 sentence 2: How can you trace text messages on cell phones?
not same meaning
same meaning
same meaning
not same meaning