动词加ed的`规则
（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
