sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: What is the primary, principle purpose of life?
 sentence 2: What should the purpose of your life? sentence 1: How do I add a t-shirt designing function to your website?
 sentence 2: How do I add a t-shirt designing function to my website?
not same meaning
same meaning
not same meaning