A:Know anything about the family?
A:I'm trying to know if it is too expensive.
B:As I see it, the price is reasonable.
A:I'm afraid I'm not quite clear how you succeeded in passing the exam.
B:I think I was just very lucky.
A:I was wondering if you could help me, I'm trying to find where he is now.
B:I'm terribly sorry,I really don't know.