原形 过去式 过去分词
have had had
keep kept kept
mean meant meant
ring rang rung
smell smelt smelt
think thought thought
动词时态的转换(急~)have\keep\mean\ring\smell\think\的过去式和过去分词
原形 过去式 过去分词
have had had
keep kept kept
mean meant meant
ring rang rung
smell smelt smelt
think thought thought