sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Why do only two parties ever get elected in the US?
 sentence 2: Why does america have only two political parties? sentence 1: Should I get the IPhone 7 when it comes out?
 sentence 2: Should I upgrade my iPhone 5s to an iPhone 7 (when it has been released)?
not same meaning
same meaning
same meaning