作业帮they did't decide what they should do(改为简单句)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/13 14:27:48
they did't decide what they should do(改为简单句)
they did't decide what they should do(改为简单句)
they did't decide what they should do(改为简单句)
They didn't decide what to do .
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,
exercis...
全部展开
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
收起