sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: I went through 3 to 4 programming competition but I don't get a good rank .I end up scoring more than 2000 rank .What do I lack?
 sentence 2: Does anyone has clear idea about surgical operation. I went through many article but couldn't get satisfy. What exactly happened there? sentence 1: How do I get pregnant just after my periods?
 sentence 2: Can a woman get pregnant three days into her cycle?
not same meaning
not same meaning
same meaning