动词过去式、过去分词变化规则
一、规则变化:
1. 一般在动词原形后加-ed
look -> looked; need -> needed
2. 以-e结尾的动词加-d
move -> moved
3. 以辅音字母加y结尾的动词,变y为i,再加-ed carry -> carried; study -> studied
4. 以元音字母加y结尾的词,直接加-ed
stay -> stayed; play -> played
5. 末尾只有一个辅音字母的重读闭音节词,双写该辅音字母,再加-ed
stop -> stopped; regret -> regretted
(但fix的过去式和过去分词x不双写,为fixed)
6. 以-r音节结尾的词,双写r字母,再加-ed

refered -> referred; prefer -> preferred
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