英语七年级上册，过去式由i变为a不规则，动词的过去式有哪些

规则动词的过去式变化如下：1、一般情况下,动词词尾加
-ed
,如：work
---worked
play---played
wanted----wanted
act----acted 2、以不发音的
-e
结尾动词,动词词尾加
-d,如：live---lived
move----moved
taste---tasted
hope---hoped 3、以辅音字母
+
y结尾的动词,把-y变为-i
再加-ed,如：study---studied
copy---copied
cry---cried
carry---carried 4、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：stop
---stopped 5、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的构成 1．把动词原形中的i改为a,变成过去式.如：begin—began,drink—drank,give—gave,ring—rang,sing—sang,sit—sat,swim—swam 2．把重读开音节中的i改为o,变成过去式.如：drive—drove,ride—rode,write—wrote 3．改动词原形中的aw
／ow为ew,变成过去式.如：draw—drew,grow—grew,know—knew,throw—threw（动词show除外,show—showed） 4．动词原形中的e改为o,变成过去式.如：get—got,forget—forgot 5．动词原形中的ee改为e,变成过去式.如：feed—fed,meet—met 6．动词原形中的eep改为ept,变成过去式.如：keep—kept,sleep—slept,sweep—swept 7．动词原形中的eak改为oke,变成过去式.如：break—broke,speak—spoke 8．动词原形中的ell改为old,变成过去式.如：sell—sold,tell—told 9．动词原形中的an改为oo,变成过去式.如：stand—stood,understand—understood 10．以ought和aught结尾,且读音是〔
:t〕的过去式.如：bring—brought,buy—
bought,think—thought,catch—caught,teach—taught 11．以ould结尾且读音为〔ud〕的情态动词过去式.如：can—could,shall—should,will—would 12．把动词原形中的o改为a,变成过去式.如：come—came,become—became 13．在动词原形后加d或t变成过去式,并且发生音变.如：hear〔hi
〕—heard〔h
:d〕,say〔sei〕—said〔sed〕,mean〔mi:n〕—meant〔ment〕 14．动词的过去式与动词原形一样.如：let—let,must—must,put—put,read—read〔red〕 15．不符合上述规律的动词过去式.如：am,is—was,are—were,build—built,do—did,eat—ate,fall—fell,feel—felt,find—found,fly—flew,go—went,have
／has—
had,hold—held,leave—left,make—made,may—might,run—ran,see—saw,take—took 过去式“-ed”的发音规则 （1）动词词尾为“t,d”时,发/
id
/音,want
→wanted
（要）need
→needed
（需要） （2）动词词尾为清辅音时,发/
t
/
音.help
→helped
（帮助）laugh
→laughed
（笑）look
→looked
（看） kiss
→kissed
（吻）wash
→washed
（洗）
watch
→watched
（注视） （3）动词词尾为t,d以外之浊辅音或元音时,发/
d
/音.call
→called
（叫）stay→stayed
（停留）cry→cried
（哭）