step的过去式和过去分词?
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step的过去式和过去分词?
stepped
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step的过去式
不变
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walk的过去式和过去分词
walked,walked
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decide的过去式和过去分词
decide vt. 决定; 决心; 解决; 裁决 vi. 决定; 下决心 第三人称单数: decides 现在分词: deciding 过去式: decided 过去分词: decided 形近词: geocide excide incide decine decile 英 [dɪˈsaɪd] 美 [dɪˈsaɪd]
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sing的过去式和过去分词是什么
过去式和过去分词构成法 1)英语中大部分动词都以加-ed词尾的办法构成过去式及过去分词: 现在时(动词原形) 过去式 过去分词 work worked worked appearappeared appearedtalk talkedtalkedplay played played这类动词称为规则动词(Regular Verbs)。2)在加-ed 词尾时要注意几个问题:a.若末尾已有字母e,则只加-d: live —— lived please —— pleased free —— freedb.若以“辅音(字母)+y”结尾,先变y为i再加-ed: try —— tried study —— studiedsimplify —— simplifiedc.若是以“一个元音字母+ 一个辅音字母”结尾,该音节又重读者,末尾字母要双写,然后再加-ed: stop —— stoppedfit —— fitted chat —— chattedd.其他的词都直接加-ed: lack —— lacked open —— openedrepeat —— repeated3)另外,还有几点值得注意:a.以“一个元音+l”结尾的词,英国人都把l双写,美国人都不双写: travel —— travelled (英),traveled (美) marvel —— marvelled (美),marveled (美)b.l前若有两个元音,l一概不双写(英美都如此): reveal —— revealled appeal —— appealedc.有少数词,尽管末尾音节并不重读,末尾辅音字母在英国仍双写: worship —— worshipped (英) ,worshiped (美) kidnap —— kidnapped (英), kidnapped (美)但progarm—— programmed(英,美),progarmed(美国人有时用这种拼法)。d.以x结尾的词,x不双写: mix —— mixed fix —— fixed4)在英语中,在加-ed词尾时,末尾字母双写的词常见的有:banchopdropgripknitnetplanrubshrugslamstarswaptrapabetcontrolexpelrecap barclapdrumgunlagnipplodscanshunslapstemtagtrimabhordeferincurrefer batcramdubhopmannodplugscarsinslipsteptantripacquitdeterinstilregret begcropfanhugmarpadpopscrapsipsnapstoptaptrotadmitdistiloccurremit blotdamfithummobpatpropskrubskidsobstrapthinwagallotemitomitrepel bragdipflagjammoppenripshipskimspotstripthrobwrapcommitenroloutwitsubmit brimdotgrapjogmugpinrobshopskinsquatstuntip compelequippatroltransmit chatdraggrinjotnagpitrotshredskipstapsuntop conferexcelpropelhandicap 5)下面的词在加-ed时,在英国末尾字母要双写,而在美国却不一定双写:cancellabelprogramshrivel diallevelquarreltotal equalmarvelrefueltravel hiccupmodelreveltunnel initialpedalrivalunravel kidnappencilshovelworship 注:在加-ing 词尾时,4)中所列词的情况也一样。
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以上是关于step的过去式的问答