动词如何变过去式规则变法是直接+ed不规则动词如何变?buy的过去式是什么还有air的过去式我要就是那个总结出来的，不规则动词，各种各样的变法

有很多例如cut-cut,put-put,read-read,这是不变的，还有do-did，come-came，give-gave，swie-swam，take-took等这是不规则变化的。
buy的过去式是bought

bought

发疯哇惹我

buy的过去式是bought
特殊的要记

一、不规则动词的过去式和过去分词相同,即“ABB”型
1.元音字母有变化的有：
get—got—got(得到)
sit—sat—sat(坐)
win—won—won(获得、赢得)
shine—shone—shone(发光)
find—found—found(发现)
hold—held—held(握)
meet—met—met(遇见)
stand—stood—stood（站立）
understand—understood—understood(理解)
2.辅音字母有变化的有：
make—made—made(做)
have/has—had—had(有)
build—built—built(建立)
lend—lent—lent(借出)
spend—spent—spent（花费）
3.在原动词后加“t”或“d”的有：
learn—learnt—learnt(学习)
mean—meant—meant(意思是)
hear—heard—heard(听见)
pay—paid—paid(付款)
say—said—said(说)
4.元音字母和辅音字母都有变化的有：
（A）组：
feel—felt—felt(感觉)
smell—smelt—smelt(闻)
spell—spelt—spelt(拼写)
keep—kept—kept(保持)
sleep—slept—slept(睡觉)
sweep—swept—swept(打扫)
leave—left—left(离开)
sell—sold—sold(卖)
tell—told—told(告诉)
（B）组：
catch—caught—caught(捕捉)
teach—taught—taught(教学)
buy—bought—bought(买)
bring—brought—brought(拿来)
think—thought—thought(想)

二、不规则动词的过去式和过去分词与原形相同,即“AAA”型
hit—hit—hit(打击)
hurt—hurt—hurt(伤害)
let—let—let(让)
put—put—put(放置)
read—read—read(读)

三、不规则动词的过去分词与其原形相同,即“ABA”型
come—came—come(来)
run—ran—run(跑)

四、不规则动词的过去式和过去分词不同,即“ABC”型
1.在元音字母上变化：
ring—rang—rung(按铃)
sing—sang—sung(唱歌)
drink—drank—drunk(喝)
swim—swam—swum(游泳)
begin—began—begun(开始)
2.在动词原形后加“－en”构成过去分词:
eat—ate—eaten(吃)
fall—fell—fallen(落下)
ride—rode—ridden(骑)
write—wrote—written(写)
be—was/were—been(是)
3.在动词的原形后加“－n”构成过去分词:
see—saw—seen(看见)
give—gave—given(给)
drive—drove—driven(驾驶)
take—took—taken(取)
mistake—mistook—mistaken(弄错)
blow—blew—blown(吹)
throw—threw—thrown(扔)
draw—drew—drawn(绘制)
grow—grew—grown(成长)
know—knew—known(知道)
show—shew—showen(出示)
4.在动词的过去式后加“－n”构成过去分词:
break—broke—broken(打破)
speak—spoke—spoken(说)
choose—chose—chosen(选择)
5.其它情况：
do—did—done(做)
go—went—gone(去)
fly—flew—flown(飞)
lie—lay—lain(躺)
buy的过去式是bought

不规则的动词需要记。 buy的过去式是bought

不规则没有规律啊，不规则嘛，不过细心还是有些规律的，
buy--bought catch--caught
下点功夫，多背就发现规律了