keep的过去分词是不规则的,并不是说加上-ed即可,所以需要死记硬背。
keep--kept再告诉你一些不规则的吧
不定式 过去式 过去分词
arise arose arisen
be(is am are) was were been
become became become
bring brought broght
build built built
cast cast cast
do did done
(够了咩?)