一般过去时动词的变化规则
规则动词的过去式变化如下：
一般情况下，动词词尾加 -ed ，如：
worked played wanted acted
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
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
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
注：不规则动词的过去式变化规律性不强，须多加记忆。
go – went make - made get - got buy - bought come - came fly-flew
不规则动词的过去式：
a.过去式与动词原形的拼写形式相同：
let → let, put → put, read → read(注意read的过去式读[red])
b. i → a:
begin → began, drink → drank, give → gave, ring → rang, sing → sang, sit → sat, swim → swam
c. i → o:
drive → drove, ride → rode, write → wrote
d. ow → ew:
grow → grew, know → knew, throw → threw
e. 含ough或augh的：
bring → brought, buy → bought, think → thought；catch → caught, teach → taught
f. am is ---was are ---were do---did can---could come---came
不规则动词的过去式平时出现要留心，逐个熟记，注意积累。