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