询问与回复的常用句型_英语口语

if you require some information you can say:
could you tell me if/when/how much/why...?
i wonder if you could tell me...?
i'd like to know...
i'd like some information about...

if someone asks you for information you can reply:
as far as i know...
well,(in confidence,) i can tell you that...
i'm afraid i don't know...
i've no idea,i'm afraid...
i don't have that information available just now,can i call you back?
i'm not sure,i'll have to find out,can i let you know tomorrow?
i'm afraid i can't tell you that,it's confidentail.