And if all else fails, know that when the forces seem like absolute imperatives requiring strong reactions, it's time to backtrack to #3.
If all else fails, know that sedation is an option.
If all else fails, know surgery is an option.
Though you may indeed fail, know that victory is always possible.
But the woman who back in 2010 first used the phrase "if the euro fails, Europe fails" knows that a Grexit under her watch would form more than just a footnote in any summary of her leadership.
The talent is obvious, even to us failed know-it-alls.
"There she is … how could I have failed to know this?" Who is it?
It also would have the advantage of assigning responsibility, so that if the program failed we know whom to blame.
You might have failed to know what your fire was doing at all times (the second fire order) or to keep informed about fire weather (the first).
People who are obese have likely tried to lose weight and failed; they know exactly how difficult the journey is.
Purely quantificational use: In this instance not only does the teacher fail to know the identity of the cheater, but also fails to know whether or not there was a unique cheater (perhaps there were several).
