简单来说就是以重读闭音节结尾的双写在加ed
重读闭音节：在单词后三位中,第一个为辅音（除a,e,i,o,u外的字母）,第二个为元音（a,e,i,o,u）,第三个为辅音,双写最后一个辅音字母,再加ed
比如
planned
fitted
但不是所有单词都这样
rob的过去式robbed,为什么要双写b?
1个回答
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