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 1) 一般情况下在词尾直接加ed。 如:play― played work― worked
  2) 以e结尾的动词只加d. 如:like— liked love― loved
  3) 以辅音字母+Y结尾的动词,变Y为I,再加ed. 如:study― studied carry― carried
  4) 以重读闭音节结尾的动词,如果末尾只有一个辅音字母,要双写最后这个辅音字母,再加ed. 如:stop― stopped
  (5)–ed的读音规则如下:
  1) 在清辅音后面读[t].
  2) 在浊辅音或元音后读[d].
  3) 在[t] 和[d] 后读[id].
  (6)不以ed 结尾的过去式,称为不规则动词。
  一般过去时态的“三变”技巧
  一变:肯定句变为否定句h
  【技巧1】当句中含有情态动词或助动词could,would,should等时,可直接在其后面加not构成否定句。例如:
  I could get you a concert ticket. → I could not / couldn\’t get you a concert ticket.
  【技巧2】当句中含有系动词was,were 时,可直接在其后加not构成否定句。例如:
  I was on the Internet when you called me. → I was not / wasn\’t on the Internet when you called me.
  【技巧3】当句中谓语是除情态动词、助动词、系动词was, were以外的动词时,在该动词之前加did not / didn\’t,动词还原,构成否定句。例如:
  The famous singer sang some Chinese songs. → The famous singer did not / didn\’t sing any Chinese songs.
二变:陈述句变为一般疑问句
  【技巧1】移动词语的位置。将was,were, could,would,should等移到句首。例如:
  He could pack his things himself. → Could he pack his things himself?
  【技巧2】添加助动词did。谓语是除情态动词、助动词、系动词was, were以外的动词时,在主语之前加did,动词还原。例如:
  Mr Li looked very old. → Did Mr Li look very old?
三变:陈述句变为特殊疑问句
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