sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: How many orders does Amazon.co.uk process per hour?
 sentence 2: How many books does Amazon ship per day? sentence 1: Why do people use '--' instead of '—'?
 sentence 2: Why do people use then instead of than? sentence 1: How do you potty train White Pitbull puppies?
 sentence 2: How do you potty train a 6-month old Pit Bull?
not same meaning
not same meaning
not same meaning
same meaning