动词第三人称单数变化规则如下89373演示教学

动词第三人称单数变化规则如下89373
高三英语复习
动词第三人称单数变化规则
1) 一般情况下，动词后面直接加 -s. 例如： works gets says reads
2) 以ch,sh,s,x 或 o 结尾的动词,在后面加 -es。

例如：
go-goes teach-,teache wash-washes brush-brushes ,catch-
catches ,do-does ,fix -fixes
3) 以辅音字母 + y结尾的动词，把 y变为 i 再加 -es. 例如：
study- studies try-tries carry-carries ,fly-flies cry-cries
现在分词变化规则
1.直接+ ing(例：sleep+ing sleeping)
2.去e+ing(例：bite-e+ing biting)
3重读闭音节，且末尾只有1个辅音字母，双写辅音字母+ing(例：sit+t+ing sitting)
4.特殊变化：die-dying,lie-lying，tie-tying
3、现在分词的变化规则：
（1）一般情况下，直接在动词后加－ing
work ---- working
sleep ----- sleeping
study ----- studying
（2）动词以不发音的－e结尾，要去－e加－ing
take ----- taking
make ----- making
dance ----- dancing
（3）重读闭音节的动词，要双写词尾字母，再加－ing
cut ----- cutting
put ----- putting
begin ------ beginning
（4）以－ie结尾的动词，把变成y再加－ing
lie ----- lying
tie ----- tying
die ----- dying
① 一般单音节词末尾加er 和est
② 单音节词如果以e结尾，只加r 和
st
③ 闭音节单音节词如末尾只有一个辅音字母，
须先双写这个辅音字母，再加er和est ④ 少数以y,er(或ure),ow,ble 结尾的双音节词，末尾加er和est(以y结尾的词，如y前是辅音字母，把y 变成i，再加er和est，以e结尾的
词仍加r和st)
3. big bigger biggest
hot hotter hottest
thin thinner thinnest
4. easy easier easiest
busy busier busiest
happy happier happiest
5. valuable more valuable most valuable
dangerous more dangerous most dangerous
comfortable more comfortable most comfortable
1. 有几个形容词有特殊的比较级和最高级形式：
原级比较级最高级
good well better best
bad ill worse worst
many much more most
little less least far farther further farthest furthest
old older elder oldest eldest
2. 双音节词除了以“辅音＋y”结尾的词外，还有以ow, er, le结尾的词，和个别其他双音节词，可以用加词尾的办法构成比较级和最高级：原级比较级最高级
narrow narrower narrowest
clever cleverer cleverest
simple simpler simplest
common commoner commonest
3. 也有少数单音节词可以加more和most的办法构成比较级和最高级：
原级比较级最高级
pleased more pleased most pleased
tired more tired most tired
glad more glad most glad
名词的复数形式
其它名词复数的规则变化
1) 以y结尾的专有名词，或元音字母+y 结尾的名词变复数时，直接加s变复数：如： two Marys the Henrys
monkey---monkeys holiday---holidays
比较：层楼：storey ---storeys story---stories
2) 以o 结尾的名词，变复数时：
a. 加s，如： photo---photos piano---pianos
radio---radios zoo---zoos；
b. 加es，如：potato--potatoes tomato--tomatoes
c. 均可，如：zero---zeros / zeroes
3) 以f或fe 结尾的名词变复数时：
a. 加s，如： belief---beliefs roof---roofs
safe---safes gulf---gulfs；
b. 去f,fe 加ves，如：half---halves
knife---knives leaf---leaves wolf---wolves
wife---wives life---lives thief---thieves；
c. 均可,如： handkerchief:
handkerchiefs / handkerchieves
动词变名词
1.在词尾加er,r ,双写加er 或or:
A. play _ player, sing _ singer, wait _ waiter , find _ finder,
thrill _ thriller，hunt-hunter
B. write _ writer, drive _ driver, come _ comer, explore _ explorer
dance _ dancer
C. run _ runner, win _ winner, rob _ robber, traval _ travaller
D. visit _ visitor, invent _ inventor,act-actor,advise-advisor
2. 在词尾加ing:
build _ building, draw _ drawing, end _ ending, begin _ beginning,
swim _ swimming， skate _ skating, feel _ feeling, say _ saying,
mean _ meaning, cross _ crossing， surf _ surfing, paint _ painting
3.在词尾加ion 或去e加ion:
A. decide _ decision, describe _ description, produce _ production, celebrate _ celebration,pronounce _ pronunciation, decorate _ decoration graduate _ graduation,frustrate - frustration,pollute _ pollution
contribute _ contribution, congratulate _ congratulation,
educate _ education，organize _ orgnization,donate _ donation, appreciate _ appreciation，operate _ operation, invite _ invitation
B. discuss _ discussion, invent _ invention, attract _ attraction
impress _ impression,inject _ injection,instruct _ instruction
4.其它：
know _ knowledge, please _ pleasure, enjoy _ enjoyment,
practise _ practice， die _ death, succeed _ success, weigh _ weight,
sit _ deat, change _ chance，enter _ entrance,fly _ flight,
rob _ robbery, discover _ discovery，faile _ failure,appear _ appearance, breathe _ breath。