1 規則動詞詞尾加-ed有三種讀音
1.1 以清輔音結尾，加-ed
在清輔音后讀作[ t ]。如：
ask → asked look → looked
help → helped watch → watched
stop → stopped work → worked
pass → passed dance → danced
brush → brushed wash → washed
laugh → laughed
備注：除了清輔音t
1.2 以元音或濁輔音結尾，加-ed
在濁輔音和元音后讀作[ d ]。如：
play → played enjoy → enjoyed
stay → stayed answer → answered
cry → cried study → studied
move → moved lives → lived
close → closed use → used
call → called rain → rained
備注：除了濁輔音d
1.3 以t或d結尾，加-ed
在 t 或 d 后讀作[ id ]。如：
want → wanted wait → waited
need → needed shout → shouted
add → added paint → painted
2 動詞加-ed的構成形式
2.1 規則動詞
規則動詞的過去式由“動詞原形+-ed”構成，具體變化有：
（1）直接在詞尾加-ed。如:
want → wanted work → worked
need → needed clean → cleaned
（2）以不發音的e結尾的在詞尾加-d。如：
like → liked live → lived
use → used move → moved
（3）以一個元音字母加一個輔音字母結尾的重讀閉音節動詞，先雙寫結尾的輔音字母，再加-ed。如：
stop → stopped trip → tripped
（4）以輔音字母加y結尾的動詞，先把y變成i，再加-ed。如：
study → studied carry → carried
hurry → hurried cry → cried
2.2 不規則動詞
不規則動詞的過去式見課本后的不規則動詞表。大體上歸納有以下六條記憶法：
（1）以t結尾的詞，過去式與原形相同。如：
put → put let → let
cut → cut beat → beat
（2）以d結尾的詞，把d變成t。如:
build → built lend → lent
send → sent spend → spent
（3）以n結尾的詞，在詞后加t。如：
mean → meant burn → burnt
learn → learnt gain → gained
（4）以ow或aw結尾的詞，把ow / aw變成ew。如：
blow → blew draw → drew
know → knew grow → grew
（5）含有雙寫字母的詞，將雙寫改為單寫，在詞尾加t。如：
keep → kept sleep → slept
feel → felt smell → smelt
（6）含有元音字母o或i的詞，將o / i變成a。如：
sing → sang give → gave
sit → sat drink → drank