sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: If your roommate smokes, and you can smell the smoke later, is that harmful smoke you are inhaling or is that just the odor of smoke?
 sentence 2: How do I smoke a cigarette without inhaling it? sentence 1: What is the best website for Photoshop Tutorials?
 sentence 2: Which is the best website for Photoshop tutorials? sentence 1: What do Russian citizens think of Vladimir Putin?
 sentence 2: What does the Russian population think of Vladimir Putin?
not same meaning
not same meaning
same meaning
same meaning