sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: How will you stop illegal immigration?
 sentence 2: How can the U.S. stop illegal immigration? sentence 1: How do I get rid of the worst past failure or guilt?
 sentence 2: How could you get rid of self guilt?
not same meaning
not same meaning
not same meaning