1个人步行用ON FOOT,那2个人用ON FEET?

1个人步行用ON FOOT,那2个人用ON FEET? 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 “步行”用英语怎么说?不是 on foot I often go to school on feet(foot)我搞不懂.怎么会用feet 上网查 都是foot 是 walk on feet 还是 walk on foot on foot有没有复数on feet? go to shool on foot 为什么是foot而不是feet? ①用 on foot 提问 为什么英语步行是on foot而不是by foot? 英语翻译The boy ____________to school on foot.那男孩不愿步行上学Why does I often go ?.?处是填by foot,by walk,on feet还是on foot?