動詞加ed的規則
（1）一般情況下,動詞詞尾加ed,如：worked played wanted acted
（2）以不發音的e結尾動詞,動詞詞尾加d,如：lived moved decided declined hoped judged raised wiped
（3）以輔音字母+y結尾的動詞,把y變為i再加ed,如：studied tried copied justified cried carried embodied emptied
（4）以一個輔音字母結尾的重讀閉音節動詞,雙寫詞尾輔音字母,再加ed,如：stopped begged fretted dragged dropped planned dotted dripped