on foot有没有复数on feet?如果没那on feet什么意思

on foot有没有复数on feet?如果没那on feet什么意思 walk on feet 还是 walk on foot 步行是 on foot 还是on feet 因为是两只脚,是不是用复数啊 stand on your own foot 中是用foot 还是用feet go to shool on foot 为什么是foot而不是feet? 脚是不是foot 复数 feet. I often go ?.?处是填by foot,by walk,on feet还是on foot? She goes to work on foot还是feet on foot 五年级英语上册47页第二题为什么on foot的foot不是feet 请问go on foot on foot walk有区别吗? take bus /On foot/ On feet/ By the bike 中文是什么 1个人步行用ON FOOT,那2个人用ON FEET? On foot 为什么不说成 on feet?其实用的不是一只脚呀. can she get to park on foot .为什么不是On feet. The old man goes to the park _____ every morning.A on foot B on feet I am determined to go there ______ instead of taking a busA：on the foot B：on foot C：by foot D：on two feet feet为什么是foot的复数