sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Is Quora degrading?
 sentence 2: Is Quora degrading itself? sentence 1: What's the best treatment for inattentive ADHD (ADHD-PI)?
 sentence 2: Is there anyone who is suffering from inattentive ADHD and trying to do a PhD? If so, how are you managing it?
not same meaning
same meaning
not same meaning