1．规则动词过去式的变化规则
1）一般在动词词尾加ed.
work—worked,rain—rained,watch—watched
2）如果动词以字母e结尾,变过去式时直接在词尾加d.
love—loved,live—lived,change—changed
3）如果动词是以一个元音字母加上一个辅音字母结尾的重读闭音节单词,变过去式时,要双写这个辅音字母,再加ed.
stop—stopped,plan—planned,drop—dropped
4）如果动词是以辅音字母加y结尾,变过去式时要变y为i再加ed.
study—studied,carry—carried,try—tried
2．部分不规则动词的过去式
let—let(让),put—put(放),read—read(读),run—ran(跑)
come—came(来),become—became(成为),bring—brought(带来),buy—bought(买)
go—went(去),think—thought(想),catch—caught(抓住),teach—taught(教)
lend—lent(给),send—sent(寄,送),feel—felt(感觉),keep—kept(保持)
leave—left(离开),meet—met(遇见),learn—learnt/learned(学习)
sell—sold(卖),tell—told(告诉),hold—held(抓住),get—got(得到)
hear—heard(听),make—made(制造),sit—sat(坐),find—found(发现)
see—saw(看见),begin—began(开始),swim—swam(游泳),sing—sang(唱)
write—wrote(写),know—knew(知道),show—showed(出示)
speak—spoke(讲),take—took(拿走),eat—ate(吃),give—gave(给),find—found(找)