什么时候双写再加ed

什么时候双写再加ed

看单词后面三个字母，如果是辅音+元音+辅音，则双写，否则不双写

表示一般过去式的动词通常用动词的过去式形式来表示，而动词的过去式是在动词原形的基础上变化的。动词的过去式可分为规则动词和不规则动词。规则动词的过去式变化如下： （1）一般情况下，动词词尾加 -ed ，如： worked played wanted acted （2）以不发音的 -e 结尾动词，动词词尾加 -d，如：lived moved decided declined hoped judged raised wiped （3）以辅音字母 + y结尾的动词，把-y变为-i 再加-ed，如： studied tried copied justified cried carried embodied emptied （4）以一个辅音字母结尾的重读闭音节动词，双写词尾辅音字母，再加 -ed，如： stopped begged fretted dragged dropped planned dotted dripped （5）注：不规则动词的过去式变化规律性不强，须多加记忆。 go - went， make - made， get - got ， buy - bought ，come - came ， fly-flew ， is/am-was，are-were ， see-saw ， bring-brought， do-did， teach-taught, think-thought, say-said, sit-sat. read-read, spend-spent, eat-ate, give-gave, sit-sat, tell-told, write-wrote, fell-felt, find-found, hear-heard, know-knew, put-put, grow-grew, take－took, catch-caught, come-came， become-became, swim-swam， sweep—swept， sing—sang，draw—drew，