sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Is it wrong to be in a sexual relationship with someone older than you?
 sentence 2: Is it wrong for an 18-year-old to be in a relationship with a 60-year-old? Request sentence 1: Why are planetary orbits ellipses?
 sentence 2: Why are the orbits of planets elliptical?
not same meaning
same meaning
same meaning