1 规则动词词尾加-ed有三种读音
1.1 以清辅音结尾，加-ed
在清辅音后读作[ t ]。如： ask → asked look → looked help → helped watch → watched stop → stopped work → worked pass → passed dance → danced brush → brushed wash → washed laugh → laughed备注：除了清辅音t
1.2 以元音或浊辅音结尾，加-ed
在浊辅音和元音后读作[ d ]。如： play → played enjoy → enjoyed stay → stayed answer → answered cry → cried study → studied move → moved lives → lived close → closed use → used call → called rain → rained 备注：除了浊辅音d1.3 以t或d结尾，加-ed
在 t 或 d 后读作[ id ]。如： want → wanted wait → waited need → needed shout → shouted add → added paint → painted
2 动词加-ed的构成形式
2.1 规则动词 规则动词的过去式由“动词原形+-ed”构成，具体变化有：（1）直接在词尾加-ed。如: want → wanted work → worked need → needed clean → cleaned（2）以不发音的e结尾的在词尾加-d。如： like → liked live → lived use → used move → moved（3）以一个元音字母加一个辅音字母结尾的重读闭音节动词，先双写结尾的辅音字母，再加-ed。如： stop → stopped trip → tripped（4）以辅音字母加y结尾的动词，先把y变成i，再加-ed。如： study → studied carry → carried hurry → hurried cry → cried2.2 不规则动词
不规则动词的过去式见课本后的不规则动词表。大体上归纳有以下六条记忆法：（1）以t结尾的词，过去式与原形相同。如： put → put let → let cut → cut beat → beat（2）以d结尾的词，把d变成t。如: build → built lend → lent send → sent spend → spent（3）以n结尾的词，在词后加t。如： mean → meant burn → burnt learn → learnt gain → gained（4）以ow或aw结尾的词，把ow / aw变成ew。如： blow → blew draw → drew know → knew grow → grew（5）含有双写字母的词，将双写改为单写，在词尾加t。如： keep → kept sleep → slept feel → felt smell → smelt（6）含有元音字母o或i的词，将o / i变成a。如： sing → sang give → gave sit → sat drink → drank