some people go to school by ---------- (小船)

Some people go to school by (boat,小船)。有些人乘坐小船上学。by boat,乘坐小船。要填交通工具的原形。 再问： 不加S吗？ 再答： 不加。介词 by 后面都是名词的单数形式，如by plane，by bike。再问： 哦，谢谢，帮我翻译一下 it is difficult for me to get to school before eight when it snows 再答： 译：当下雪的时候，我很难在八点以前到校。