sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Clinton or Trump: who is a better option for the USA?
 sentence 2: How is Hillary Clinton a better choice than Donald Trump? sentence 1: Did time machine exist?
 sentence 2: If a thing didn't exist, would people spend a lot of time debating its existence? sentence 1: Do pigeons fall in love?
 sentence 2: I have a fresh pigeon's abandoned egg with me. What should I do with it? Is there any chance the baby can come out?
not same meaning
same meaning
not same meaning
not same meaning