常用不规则过去式： hurt →hurt（受伤） read →read put →put swim→swam give→gave sing----sang drink→drank ride→rode drive→drove write→wrote
win→won buy--bought fly----flew say---said learn----learned/learnt see---saw take---took get----got make-----made eat----ate leave-----left go----went---gone have---had run---ran tell---told come---came。
bu过去式是什么
没有这个词吧，是be吗，有两种，be包括am，is，are.
am和is的过去式是was，are的过去式是were
