foot与feet的用法区别（脚）

具体指脚时或英尺时的复数,就用feet
如
How many feet do you have?
I have two.
He is 6 feet tall.
foot：用在短语中或构成一些词：
如
on foot步行,也可用with feet（但不是步行,而是用脚的意思）,但不用with foot的
football；
footprint脚印
如
I often go home on foot.
Punching with fists and kicking with feet are allowed in taekwondo.
跆拳道允许用拳击和用脚踢.