关于英语变句形,变成过去时的,比如do变did,还有什么要变的吗＞?

关于英语变句形,变成过去时的,比如do变did,还有什么要变的吗＞?

动词都要变成过去式 有规则的和不规则的
1）规则变化：
构成规则
原形
过去式

在词尾加ed
walk, look
help, watch
walked, looked
helped, watched

以字母e结尾的词直接加d
live, hope,
exercise, dance
lived, hoped,
exercised, danced

重读闭音节的词先双写尾字母,然后加ed
plan, stop
planned, stopped

以“辅音字母+y”结尾的词先改y为i,再加ed
study, worry,
studied, worried,

（2）不规则变化：
①过去式不改变：这一类不规则变化的动词都是以-t或者以-d结尾的.
cost—cost cut—cut hit—hit hurt—hurt
let—let put—put read—read
②有字母组合-ee或者-ll的动词.省略原形动词中两个相同的字母中的其中一个,然后在词尾叫-t.
keep—kept sleep—slept sweep—swept
feel—felt smell—smelt spell—spelt
③ 以字母-d或者-t结尾、中间的字母组合多数是-ee或者-oo的动词,省略原形动词中两个相同字母中的其中一个.
meet—met shoot—shot
④ 把原形动词的最后一个字母-d改成-t.
send—sent lend—lent rend—rent
spend—spent build—built
⑤动词原形中有-ow,-aw这些字母组合的,过去式中把这些组合改成-ew.
blow—blew grow—grew know—knew
throw—threw draw—drew
⑥动词原形中有字母组合-in(m)或者-ing或者-ink,过去式中把字母-i变成-a.
begin—began sing—sang ring—rang
drink—drank swim—swam
⑦不规则动词以-m,-n结尾的,过去式在原形动词词尾加-t或者-d.
mean—meant learn—learnt dream—dream thear—heard
⑧过去式有-ought, -aught的.
think—thought buy—bought bring—brought
teach—taught catch—caught
⑨动词原形是以元音字母-i加辅音字母加不发音的-e结尾的,一般是在过去式中将字母i改成-o.
ride—rode write—wrote drive—drove
⑩动词原形中有-ea或者-ee或者-oo的字母组合的不规则动词,动词过去式是将这个字母组合改成-o,然后在词尾加-e.
break—broke speak—spoke choose—chose
动词原形中有字母组合-ay的,过去式改成-aid.
say—said pay—paid