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动词第三人称单数形式
主语有三单,动词也有三单,快点来习惯,体会在心里,一定要过关.
一、概念
动词第三人称单数：主语是第三人称单数，即谓语动词的发出者是it、she、he、可数名词单数、不可数名词等表示单数概念的词时，实义动词后面要加-s或-es。（注意：若主语不是第三人称单数形式，就直接用动词原形；若主语是三单，后有will等情态动词修饰时，动词也用原形。）
二、动词三单变化规则（只有一般现在时才有第三人称单数）
动词第三人称单数的变化规则及发音规律，同名词单数变复数大致相同，请认真观察。
1、大多数实义动词在词尾加“s”，在清辅音后发音为/ s / ，在浊辅音及元音因素后发音为 / z /。 如：speak→ come→ play→
2、以辅音字母加“y”结尾的动词，要先将“y”变为“i”，然后再加“es”，读/z/。 如：study→ fly→
3、以“s，x，ch，sh”结尾的动词，在词尾加“es”，发音为/ iz / 。
如：teach→ watch→
4、以“o”结尾的动词,在词尾加“es”。
常出现的两个以“o”结尾的动词go和do后加“es”，读/z/ 。
如：go→ do→
5、记住最为特别的be的三单is ；have的三单是has。
[注意]（1）下面两个动词变三单时，原词的元音部分的发音发生了较大的变化，要记忆。 如：do/du:/ →does/d z/ ; say/sei/ → says /sez/
（2）以不发音字母“e”结尾的开音节词，如果尾音是[s]，[z]时，加“s”后字母“e”发音， 与所加“s” 一起读做[iz]。 如： close－closes [iz]
三、动词第三人称单数的句子结构。
1、肯定/否定句
三单+is +表语 . 三单+动词第三人称单数+其他 .
三单+is+not+表语 . 三单+doesn't +动词原形+其他 .
2、一般疑问句
1）当谓语动词是be动词时，一般疑问句结构为“Is+三单+表语？”。它的肯定回答为： Yes, 三单+is. ;否定回答为：No，三单+isn't.。
2）当谓语动词是实义动词时，在肯定句句首加助动词does,即“Does+三单+动词原形+ 其他？”。它的肯定回答为：Yes，三单+does.;否定回答为：No，三单+doesn't.。
3、特殊疑问句
特殊疑问词+一般疑问句
四、要点
1）一定要看准句子的主语是第三人称而且还是单数；
2）经常与频率副词连用：always (一直，总是），usually（通常），often (经常），sometimes （有时），seldom (很少），hardly (几乎不），never (从不），once a day (一天一次），twice a week(一周两次），three times a month(一个月三次）。
如:I often speak Chinese. 我经常说汉语。
练习题
I、写出下列动词的第三人称单数。
go do buy draw shout play teach make catch find swim begin dig help miss sing finish give keep dance worry sit hear get have love learn fly study come call smile be write open look drink leave read pick eat walk start tell push die ________ show vote judge buy _____ carry______ borrow listen wash II、用动词的正确形式填空。
1、I _____ (go) home by bus. 2、Jack ______(go) home by bike.
3、When ______(do)he get up? 4、Her mum ______(run) to the goose.
5、He________(do not)like apples. 6、Sam______(put) it under his arm.
7、The boy_______(chase) it. 8、Kitty______(watch)TV everyday.
9、John can’t______(find) his watch. 10、Where _____(do)Grandma live?
11、Miss Wang___(live) in America now. 12、The girls___(give) the key to Sally.
13、That key ______(open) the old box. 14、She ______(say) “I like these puppets”.
15、What_____(do)Alice find? 16、Which toy_____(do) she like?
17、He doesn’t______(know)her name. 18.、Mike ________( cook ) in a restaurant .
19、He_______( speak ) Japanese . 20、How does he______(go)to the post office?
21、He often ______( have ) dinner at home . 22、Liu Tao ____ ( do ) not like PE(体育）.
23、She ______(do) homework by herself. 24、They _____ (do) homework by themselves.
25、Kate _____ (walk) to school every day.
26、Lucy and Lily ______ (walk) to school every day.
27、David and Ben ______(be ) in Class Four ,Grade Seven .
28、The girl ___________（teach） us English on Sundays.
29、He______(feed)them at 8:00 in the morning.
30、She ____( ride ) to school from Monday to Friday .
31、We _____________ (not watch ) TV on Sunday .
32、Su Hai and Su Yang _____(work ) in a shop(在商店）.
33、There______( be) some water in the bottle(瓶子）.
34、The giant（巨人）______(climb) up the beanstalk（豆茎）.
35、Michael usually_____ (listen) to the radio in the morning.
III、选择正确的单词填到括号里。
1、What does Candy __________(wants, want ) to be ?
2、He shouldn't __________ (throw, throws ) rubbish on the floor(草地）.
3、Peter ____________ (help, helps ) his mother with the housework(家务）.
4、She never __________(run, runs ) in the library(图书馆）.
5、We will _________(fly, flies ) kites on this Sunday .
6、Tom and Mary _________(has, have ) pen pals in China .
7、They _________(speaks, speak ) English after class.
8、He _________(don't , doesn't ) get up early .
9、What _________( do, does ) your father do ?
10、Let us ___________(fly , flies ) kites on this Friday afternoon .
IV、将下列句子改为第三人称He的句型（看例句）。
例句：I brush my teeth once a day .→He brushes his teeth once a day .
1、I come from China. ___________________________________________
2、You have a big black knife. _________________________________________
3、What do you do ? __________________________________________________
4、Our parents work in an office . ___________________________________________
5、What color are your clothes ?_____________________________________________ V、A：用括号里所给词的适当形式。
1、The desk _________ ________ (have)four legs.
2、She _____ _____ (do) her homework every day.
3、Danny______ ______ (fall) and breaks his tail.
4、He _____ _______ (live) in Shijiazhuang.
5、He ______ _____ (need) a pair of shoes.
6、Danny_______ _______ (see) the apple tree.
7、She_______ _______ (come) from America.
8、My mother and father_______ ______ (walk) to the office every day.
9、Danny and her mother sometimes ______ _______ (go) for a walk after supper.
10、The train______ ______ (leave) at 10:13 am.
11、That hat ______ _______ (look) like a cat.
12、Danny ______ ______ (hurt) his nose.
B：用括号里所给词的适当形式。
1、____ the desk_______(have)four legs?
2、_____she_______(do)her homework every day?
3、_____he_____(live)in Beijing?
4、_____he_____(need)a pair of shoes?
5、______ Danny______(see)the apple tree?
6、_____she______(come)from America?
7、_____the girl_______(look)out of the window and see many birds in the sky?
8、（run）home and_______(sit)on the chair?
VI、按要求改写句子。
1、Daniel watches TV every evening .(改为否定句）
________________________________________________
2、I do my homework (家庭作业）everyday .(改为一般疑问句，作否定回答）
__________________________________________________________________________
3、She likes milk .(改为一般疑问句，作肯定回答）
__________________________________________________________________________
4、Amy likes playing computer games .(改为一般疑问句，作肯定和否定回答）
__________________________________________________________________________
5、We go to school every morning .(改为否定句）
___________________________________________________________________
6、He speaks English very well. (改为否定句）_______________________________________
7、公园）.(对划线部分提问）
______________________________________________________________
8、对划线部分提问）______________________________________
9、She is always a good student.(改为一般疑问句，作否定回答）
________________________________________________________________
10、Simon and Daniel like going shopping .(改为否定句，一般疑问句)
______________________________________________________________
_______________________________________________________________
VII、改错(划出错误的地方，将正确的写在横线上)
1. Is your brother speak English? ____________________________________
2. Does he likes going fishing? ______________________________________
5. She don’t do her homework on Sundays. ______VIII、根据所给中文意思，在空白处填入适当词语完成句子。每空一词。
1．该吃晚饭了。It’s time to ________ ________.
2．你想来点儿面包吗?Would you ________ some ________ ?
3．安太小，还不能上学。Ann is ________ young ________ go to school.
4．约翰跑得和我一样快。John runs ________ fast ________ me.
5．布莱克太太经常在英语上帮助我们。Mrs. black often _______ us ________ our English .
6．老师让我们每天说英语。The teacher tells us ________ ________ English every day.
7．为什么不让孩子们做他们喜欢的事情?_____ _______let the children do what they like? 8 . 你能告诉我你的新同学是谁吗？______ you _____ me _____ is your new ____________? 9 . 我能很会说汉语，但我只能讲一些英语和日语。
I can ______ Chinese very _____ , ______ I only can speak _______ _______ and _______ . 10 . —他在心里说了什么？_______ ______ he _______ in the letter ?
—他想要参观中国长城。He ______/_______ ______ to _______ the _______ ________ . 11 . 我们互相帮忙。 We _______ _______ ________ .
13 . —他住在英国吗？_______ he ________ ______ England ?
—是的，他是。_______ , ______ _______ .
14 . 我和我哥哥住在一起。 I ______ ______ ______ brother .
15 . 这个老人一点都不喜欢棕色。This _____ man _______ ______ brown ______ _______ .
第三人称单数
在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。但有些同学们对于哪些主语是第三人称单数还不十分清楚，现归纳总结如下：
一、人称代词he, she, it是第三人称单数。如：
He likes watching TV. 他喜欢看电视。
She has lunch at twelve. 她十二点吃午餐。
It looks like a cat. 它看起来像只猫。 二、单个人名、地名或称呼作主语；是第三人称单数。如：
①Han Mei looks like her mother. 韩梅看起来像她的母亲。
②Beijing is in China. 北京在中国。
③Uncle Wang often makes cakes. 王叔叔经常做蛋糕。
三、单数可数名词或"this / that / the+单数可数名词"作主语时，是第三人称单数。如：
①A horse is a useful animal. 马是有用的动物。
②This book is yours. 这本书是你的。
③That car is red. 那辆小汽车是红色的。
④The cat is Lucy's. 这只猫是露茜的。
四、不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时，是第三人称单数。如：
①Everyone is here. 大家到齐了。
②There is something wrong with the watch. 这块手表有毛病。
③This is a pen. 这是一支钢笔。
④That is an eraser. 那是一块橡皮擦。 五、不可数名词作主语时为第三人称单数。如：
①The milk is in the glass. 牛奶在玻璃杯里。
②The bread is very small. 那面包很小。 六、当数字或字母作主语时，看作第三人称单数。如：
①"6" is a lucky number. "6"是个吉利数字。
②"I" is a letter. "I"是个字母。
巩固练习题：
I.写出下列动词的相应形式：
1. 第三人称单数： wash_________ match _______guess______ study______
finish_________ go________ snow______ carry_________
2.写出下列动词的过去式：stop______ see________ drive ________let_______
carry______ keep_____ join______ find_______ think________
teach______ catch______
3. 写出下列动词的现在分词形式：
stay_______ begin______ forget_______
forget______ lie________ die _______ run_______ prefer______ give________ ring_______ dance______ hope_______
II. 用所给动词的适当形式填空：
1．I ________(write) to you as soon as I _______(get) to London.
2. He doesn’t feel well and ____________(not eat) any food this morning.
3. He ______ not _______(see) me come in, for he ___________(read) something with
great interest.
4. I _________(let) you have the book as soon as I _________(finish) it.
5. While we ________(wait) for our teacher, a little boy ________(run) up to us.
6. Don’t make a noise. Grandpa __________(sleep).
7.It’s seven now, Tom’s family__________(watch) TV.
8. It ________(take) me two hours to finish my homework last night.
9. What ______ your mother _______(do) at eight yesterday evening? She
_______(wash) clothes.
10. _______ it ______ (rain) when school was over yesterday?
11. What _______(do) _______ tomorrow? We ________ (play) football.
12. There ________ (be) a football match on TV this evening.
13. They said they ________ (visit) the Great Wall the next summer holiday.
14. Who _______ (dance) the best in your class?
15. Will you come if he _____________ (not come)?
16. The teacher told us the earth __________ (move) round the sun.
17. They _______ (have) a party in the garden if it ________ (not rain) tomorrow.
18. She ________ (buy) a sweater yesterday.
19. I don’t know if Mr. Wang ______ (go) to Shanghai tomorrow. If he _____ (go),
I ______ (ask) him _______ (take) some books to my daughter, because she _______ (study) there.
单项选择：
1. The students will go to the Summer Palace if it _____ tomorrow.
A. Don’t rain. B. doesn’t rain C. won’t rain
2. There _____ an English film next week.
A. will have B. is going to have C. is going to be D. was going to be
3. The picture _______ nice.
A. looks B. is looked C. look D. is looking
4. She ______ down and soon fell asleep.
A. live B. lain C. laid D. lay
5. They _____ the office at nine yesterday morning.
A. reached to B. arrived C. went D. get to
6. We shall go to Shanghai on business before you _____ back next week.
A. wil come B. came C. would come D. come
7. Don’t smoke until the plane ______ off.
A. takes B. took C. was taken D. is take
8. I saw her ____ the room this morning.
A. to enter B. entered C. enter D. enters
9.the teacher asked us ______ to school on time.
A. to come B. coming C. come D. comes
10. John is always ______ others.
A. help B. helping C. helps D. to help
11. He told us ______ at eight.
A. working B. to work C. work D. worked
12. You’d better ______ at home and ______ your homework.
A. to stay, do B. stay, do C. to stay, to do D. stay, to do
13. He sat down ______ a rest.
A. having B. have C. to have D. had
14. Uncle Wang knows _______ a washing machine.
A. how to make B. to make C. how making D. what to make
写出下列动词的第三人称单数
drink _______ go _______ stay ________ make ________
look _________ have_______ pass_______ carry ____
come________ watch______ plant_______ fly ________
study_______ brush________ do_________ teach_______ 二、用括号内动词的适当形式填空。
1. He often ________(have) dinner at home.
2. Daniel and Tommy _______(be) in Class One.
3. We _______(not watch) TV on Monday.
4. Nick _______ to the zoo on Sunday.
5. ______ they ________(like) the World Cup?
6. What _______they often _______(do) on Saturdays?
7. _______ your parents _______(read) newspapers every day?
8. The girl _______(teach) us English on Sundays.
9. She and I ________(take) a walk together every evening.
10. There ________(be) some water in the bottle.
11. Mike _______(like) cooking.
12. They _______(have) the same hobby.
13. My aunt _______(look) after her baby carefully.
14. You always _______(do) your homework well.
15. I _______(be) ill. I’m staying in bed.
16. She _______(go) to school from Monday to Friday.
17. Liu Tao _______(do) not like PE.
18. The child often _______(watch) TV in the evening.
19. Su Hai and Su Yang _______(have) eight lessons this term.
20. －What day _______(be) it today?
－ It’s Saturday.【buy的第三人称单数,】
可数名词有单数（Singular Form）和复数(Plural Form)两种形式
可数名词有单数（Singular Form）和复数(Plural Form)两种形式表示一个人或物用单数形式，表示一个以上的人或物用复数形式。
1．一般在词尾加-s。s在浊辅音后面读[z]，在清辅音后面读[s]，在[t]后与[t]一起读[ts]在[d]后与[d]一起读[dz]。
例如： book — books 书 day — days 天、日 dog — dogs 狗 tree — trees 树
2．以s，sh，ch，x结尾的词在词尾加-es，读[iz].
例如： glass — glasses 玻璃杯 watch — watches 手表 box — boxes 盒子 brush — brushes 刷子
3．以o结尾的词有些加-es，读[z]；有些加-s，读[s]。
例如： tomato — tomatoes 西红柿 potato — potatoes 土豆 photo — photos 相片 radio — radios 收音机 zoo — zoos 动物园
4．以f 或fe 结尾的词，先把f 改为v，再加–es，读[vz]。
例如： knife — knives 小刀 leaf — leaves 树叶 life — lives 生命 thief — thieves 小偷
5．以辅音字母加y 结尾的，先把y 改为i，再加-es，读[z]。
例如： story — stories 故事 city — cities 城市 family — families 家庭 baby — babies 婴儿 注意：boy — boys 男孩 toy — toys 玩具 key — keys 钥匙
6．有些名词有不规则的复数形式。
例如： man — men 男人 woman — women 妇女 tooth — teeth 牙齿 foot — feet 脚
7．有些名词的单复数形式相同。
例如； deer — deer 鹿 sheep — sheep绵羊 Chinese — Chinese 中国人 Japanese — Japanese 日本人
8．有些学科名词虽以s 结尾，但通常都做单数名词看待。例如： physics 物理 maths 数学 politics 政治 news 新闻
9．有些单数形式的名词具有复数的含义，要当作复数看待。例如： people 人们，人民 police 警察 public 公众
名词由单数变成复数的练习 写出下列名词复数
leaf______puppy_______box_______knife_______fly______fox______ bus______
bench_____ brush_____kiss______church______dish_____ruler______peach________ glass_____pencil________boy______zoo______man______roof_______sheep_______ knife______lady______key______story______watch______bamboo______city______
family______day_____apple_______eraser______speech______thief______mouse______ fish_____goose____people______ox_____Chinese_______deer_______foot______
child_______tooth_______guy________hero_______spy______boss_____monkey______ city ______ goat ______ radio ________ horse ______ dog ______
two__________(pair) of____________(shoe)
用所给的单词的复数的正确形式填空：
1>There are so many________(wolf)in the forest.
2>There are three ______(chair) in the classroom.
3>These _______(tomato) are red.
4>______(hero) are great.
5>My brother looks after two ______(baby)
6>There are some ______(deer) eating the grass.
7>My father likes to eat _______(potato).
8>Chinese ______(people)like to eat noodles.
9>I have a lot of ______(toy) in my bedroom.
10>I help my mother wash ______(dish) in thekitchen.
11>I have two ______(pencil-box).
12>There are some ______(bus)in the street.
13>Peter has eight _____(foot).
14>Linda has three _______(tooth).
15>There are some ______(child) in the garden.
16>Michael likes the ______(mouse).
17>There are some ______(goose)in the river.
18>My uncle and father are _____(man).
19>Tom and King are _____(boy).
20>Linda has three ______(tooth). 选出正确形式
1．I can see three ________ in the zoo.
A monkeys B monkeys C monkey
2.The pig has four ______.
A. foot B. feet C. foots
3.My two brothers are both ______.
A. policeman B. policemans C. policemen
4.There are four ___________ in the class.
A. Japanese B. Japaneses C. Japan
5.I can see ten _____ in the picture.
A. sheep B. dog C. pig
6.The _____ has three______.
A. boys, watches B. boy, watch C. boy, watches
7.C an you see _______on the plate?
A.bread B.breads C.breades
英语中第三人称单数
在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。但有些同学们对于哪些主语是第三人称单数还不十分清楚，现归纳总结如下：
一、人称代词he, she, it是第三人称单数。如：
He likes watching TV. 他喜欢看电视。
She has lunch at twelve. 她十二点吃午餐。
It looks like a cat. 它看起来像只猫。
二、单个人名、地名或称呼作主语；是第三人称单数。如：
①Han Mei looks like her mother. 韩梅看起来像她的母亲。
②Beijing is in China. 北京在中国。
③Uncle Wang often makes cakes. 王叔叔经常做蛋糕。
三、单数可数名词或"this / that / the+单数可数名词"作主语时，是第三人称单数。如：
①A horse is a useful animal. 马是有用的动物。
②This book is yours. 这本书是你的。
③That car is red. 那辆小汽车是红色的。
④The cat is Lucy's. 这只猫是露茜的。
四、不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时，是第三人称单数。如：
①Everyone is here. 大家到齐了。
②There is something wrong with the watch. 这块手表有毛病。
③This is a pen. 这是一支钢笔。
④That is an eraser. 那是一块橡皮擦。
五、不可数名词作主语时为第三人称单数。如：
①The milk is in the glass. 牛奶在玻璃杯里。
②The bread is very small. 那面包很小。
六、当数字或字母作主语时，看作第三人称单数。如：
①"6" is a lucky number. "6"是个吉利数字。
②"I" is a letter. "I"是个字母。
巩固练习题：
I.写出下列动词的相应形式：
1. 第三人称单数： wash_________ match _______guess______ study______ finish_________ go________ snow______ carry_________
2.写出下列动词的过去式：stop______ see________ drive ________let_______ carry______ keep_____ join______ find_______ think________ teach______ catch______
3. 写出下列动词的现在分词形式： stay_______ begin______ forget_______
forget______ lie________ die _______ run_______ prefer______ give________ ring_______ dance______ hope_______
II. 用所给动词的适当形式填空：
1．I ________(write) to you as soon as I _______(get) to London.
2. He doesn’t feel well and ____________(not eat) any food this morning.
3. He ______ not _______(see) me come in, for he ___________(read) something with great interest.
4. I _________(let) you have the book as soon as I _________(finish) it.
5. While we ________(wait) for our teacher, a little boy ________(run) up to us.
6. Don’t make a noise. Grandpa __________(sleep).
7.It’s seven now, Tom’s family__________(watch) TV.
8. It ________(take) me two hours to finish my homework last night.
9. What ______ your mother _______(do) at eight yesterday evening? She _______(wash) clothes.
10. _______ it ______ (rain) when school was over yesterday?
11. What _______(do) _______ tomorrow? We ________ (play) football.
12. There ________ (be) a football match on TV this evening.
13. They said they ________ (visit) the Great Wall the next summer holiday.
14. Who _______ (dance) the best in your class?
15. Will you come if he _____________ (not come)?
16. The teacher told us the earth __________ (move) round the sun.
17. They _______ (have) a party in the garden if it ________ (not rain) tomorrow. 18 She ________ (buy) a sweater yesterday.
19. I don’t know if Mr. Wang ______ (go) to Shanghai tomorrow. If he _____ (go), I ______ (ask) him _______ (take) some books to my daughter, because she _______ (study) there.
III单项选择：
1.The students will go to the Summer Palace if it _____ tomorrow.
A. don’t rain B. doesn’t rain C. won’t rain
2. There _____ an English film next week.
A. will have B. is going to have C. is going to be D. was going to be
3. The picture _______ nice.
A. looks B. is looked C. look D. is looking
4. She ______ down and soon fell asleep.
A. live B. lain C. laid D. lay
5. They _____ the office at nine yesterday morning.
A. reached to B. arrived C. went D. get to
6. We shall go to Shanghai on business before you _____ back next week.
A. will come B. came C. would come D. come
7. Don’t smoke until the plane ______ off.
A. takes B. took C. was taken D. is take
8. I saw her ____ the room this morning.
A. to enter() B. entered C. enter D. enters
9.the teacher asked us ______ to school on time.
A. to come B. coming C. come D. comes
10. John is always ______ others.
A. help B. helping C. helps D. to help
11. He told us ______ at eight.
A. working B. to work C. work D. worked
12. You’d better ______ at home and ______ your homework.
A. to stay, do B. stay, do C. to stay, to do D. stay, to do
13. He sat down ______ a rest.
A. having B. have C. to have D. had
14. Uncle Wang knows _______ a washing machine.
A. how to make B. to make C. how making D. what to make
15. Jim decided _______ Polly to Ling feng when he was back to England.
A. to leave B. left C. leaving D. leave
动词第三人称单数的变化规则
1．一般情况下，直接加-s，如：cook-cooks, milk-milks
2．以s. x. sh. ch. o结尾，加-es，如：guess-guesses, wash-washes,
watch-watches, go-goes
3．以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies
现在进行时动词Ing的变化规则：
动词加ing的变化规则
1．一般情况下，直接加ing，如：cook-cooking
2．以不发音的e结尾，去e加ing，如：make-making, taste-tasting
3．如果末尾是一个元音字母和一个辅音字母，双写末尾的辅音字母，再加ing，如：run-running, stop-stopping
形容词的构词特征：
1）常见的形容词词尾:
--y : dreamy, funny , gloomy , sleepy ,
--ful :helpful ,hopeful ,meaningful, harmful
--less: helpless, hopeless, meaningless ,harmless
--en: golden, silken, wooden, woolen, etc.
--able/- ible : probable, favorable ,possible, credible ,etc
-ary: contrary, secondary, extraordinary, proprietary, etc
-ive: active, passive , positive ,etc
-ous :generous, marvelous, ridiculous , treacherous , harmonious etc
-ish : boyish , selfish , sickish ,etc
-some: fearsome , handsome, tiresome , etc
-al: international, practical,
-ic: artistic, economic ,geographic , ironic etc
2)由名词加--ed结尾的形容词：
crow----crowed detail----detailed sleeve----sleeved fence---fenced
3)由名词加 ---ous 结尾的形容词
mountain----mountainous fame----famous mystery---mysterious danger--dangerous
courage--courageous
4)由动词加---ful结尾的形容词，如：
doubt---doubtful forget----forgetful cheer--cheerful
5)由名词加--ent 或 ---ant 结尾的形容词
convenience ---convenient frequence/y ---frequent defend---defendant differ---different/difference
6) 由动词加---able 结尾的词
enjoy --- enjoyable notice --- noticeable
agree --- agreeable prefer --- preferable ,
Allomorphs:
常用的反义词：
light
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