分規(guī)則變化和不規(guī)則變化兩種.不規(guī)則變化需逐個記憶,規(guī)則變化遵循以下原則：
(1) 一般情況下,在動詞后加ed構(gòu)成：work / worked, stay / stayed, shout / shouted等.
(2) 在以-e結(jié)尾動詞后只加d：close / closed, like / liked, live / lived, smile / smiled等.
(3) 以輔音字母加y結(jié)尾的動詞,應(yīng)將y改為i 再加-ed：study / studied, carry / carried等.
(4) 以重讀閉音節(jié)或r音節(jié)結(jié)尾且末尾只有一個輔音字母動詞,要雙寫末尾的輔音字母再加-ed：stop / stopped, admit / admitted, refer / referred, prefer / preferred等.