【把下面单词分别变成三单,ing形式,过去式,过去分词drop,happen,pass,receive,seem,smcke,throw,surprise,wait,push,include,freece,go,use,sweep,stop】

　　把下面单词分别变成三单,ing形式,过去式,过去分词

　　drop,happen,pass,receive,seem,smcke,throw,surprise,wait,push,include,freece,go,use,sweep,stop