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certain of/about

Posted: Tue May 29, 2012 11:03 am
by SARDORBEK
They felt quite certain …. their failure.

a) of
b) about

I think, the two answers are possible here.
My questions:
1) Are the two prepositions always interchangeable?
2) Which one is more often used?

Thank you..

Re: certain of/about

Posted: Mon Jun 04, 2012 6:19 am
by Alan
Your example is strange with either!