过去式和过去分词的用法区别 过去式是用在一般过去时的，；过去分词用在完成时态的.具体点列 就是分为规则动词和不规则动词两种情况来讲：形式变化：一.规则，过去式和过去分词都是在词末加-ed二.不规则，要背不规则动词表.用法：过去式用于“一般过去时”过去分词要和其它成分连用.1.have has+过去分词（现在完成时）2.had+过去分词（过去完成时）3.be+过去分词（被动语态）如；during the 1980s，revoluntionry changes in the work lives of Americans，caused by technological advance which will permit greater productivity by fewer workers，will likely result in shortened work weeks，increased released time for workers，and increased pressure for early retirements.revoluntionry changes 是主语中心词，caused by.是过去分词修饰主语．（其前没有助动词，这是判断是否是过去分词或过去式的一个重要的标志．所以很容易看出它不作谓语．）will likely result in 是谓语shortened work weeks 是宾语1 increased released time 是宾语2 increased pressure 是宾语3 这些~ed分词都是作形容词用．很容易理解．
求助：help和free的过去式和过去分词 helpedhelp[help]n.帮忙，补救办法62616964757a686964616fe59b9ee7ad9431333231616663，助手，治疗，<；美>；佣工vt.助长，接济，治疗，款待vi.有用，救命，招待[计]显示命令格式的简短概述HELPHelicopter Electronic Landing Path 直升飞机电子着陆系统helpHelp is something you yell when you need assistance.For example：The person was in danger so he yelled\"help\".帮忙，助手helphelpAHD：[hμlp]D.J.[help]K.K.[hWlp]v.（动词）helped，help.ing，helpsv.tr.（及物动词）To give assistance to；aid：援助：给予协助；I helped her find the book.He helped me into my coat.我帮她找到了那本书。他帮我穿好大衣To contribute to the furtherance of；promote.促进：对…有帮助；促进To give relief to：救助：给予救助：help the needy.救济穷人To ease；relieve：缓解；减轻：medication to help your cold.治疗感冒的药品To change for the better；improve：助长：发生好的变化；改进：A fresh coat of paint will help a scarred old table.涂一层新油漆将大大改观这张斑驳的老桌子To refrain from；avoid or 。
口语说解散的时候说dissimissed 同意说agreed 为什么要用过去分词呢 dismissed 英/dis'mist/谐音“迪斯美斯特”v.开除，解散（dismiss的过去分词）；摒弃 adj.解雇的；解散的，被排除的The boss dismissed him but gave no reason.老板解雇他却没有任何理由。agreed 英/？'gri？d/v.同意；赞成（agree的过去式）adj.同意的；通过协议的I agreed with him on this matter.在这个问题上，我同意他的看法。All of them agreed with me about this issue.他们都同意我关于这个问题的看法。We agreed that you should choose between us.我们同意让你在我们之间进行选择。
