every other - alternate
fall behind - lag; fail to accomplish something on time
fall through - fail to happen or be completed
far cry form - completely different from;a long way
feel like - have a desire or wish for
feel up to - feel well enough to or be capabele of
few and far between - not happening often; rate
figure out - determine; reason out by thinking
fill in for -take another’s place
fill sb.in - tell what sb. should know
fish out of water - out of one’s element or natural environment
flying colors -success,victory
for good - permanently; forever
for the time being - for now; temporarily