face to face* 面对面地
focus on 集中于
face up to 大胆面对
for example* 例如
fall behind 落后
for good 永久的，一劳永逸的
fall in love (with)* 相爱，爱上
for instance 举例说，比如
far from* 决不，绝非
for short 简称，缩写
feel like* 想要
for the moment 暂时，目前
figure out* 算出，估计，推测
for the present 目前，暂时
fill in* 填充，填写
for the time being 目前，暂时
fill out* 填好，填写
from time to time* 时常
find out* 发现，查明，找出
