过去分词用于完成时态:I have been here for 3 years.我来这已经3年了(been是be动词的过去分词) 过去式用于一般过去时态:I brought some juice here yesterday.昨天我带了一些果汁这儿。(brought是bring的过去式) 现在分词用于进行时态:He is doing his homework now.他正在做作业(doing是do的现在分词形式)
1.过去做过的用过去式,比如说:i did my homework last night. 2.过去的过去用过去分词,不如说:he told us that he had finshed his homework. 3.过去对现在有影响用现在分词,比如说:he has finshed his homework already.希望对你有帮助!!!