一般过去时动词的变化规则如下：
一般情况下，在动词词尾加-ed。例如：
play -> played
want -> wanted
act -> acted
以不发音的-e结尾的动词，在词尾加-d。例如：
live -> lived
move -> moved
decide -> decided
hope -> hoped
judge -> judged
raise -> raised
wipe -> wiped
以辅音字母+y结尾的动词，将y改为i，再加-ed。例如：
study -> studied
try -> tried
copy -> copied
justify -> justified
cry -> cried
carry -> carried
embody -> embodied
empty -> 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。例如：
stop -> stopped
beg -> begged
fret -> fretted
drag -> dragged
drop -> dropped
plan -> planned
dot -> dotted
drip -> dripped
不规则动词的变化没有固定的规则，需要单独记忆。例如：
be -> was/were
go -> went
make -> made
get -> got
buy -> bought
come -> came
fly -> flew
see -> saw
bring -> brought
do -> did
teach -> taught
think -> thought
say -> said
sit -> sat
建议：对于不规则动词，可以通过造句和记忆例句来加深印象，从而更好地掌握其过去式。