2026年中考英语重难点语法讲练----冠词、名词、情态动词

这是一份2026年中考英语重难点语法讲练----冠词、名词、情态动词，共16页。试卷主要包含了前言，考点梳理与核心讲解，专项巩固练习，真题综合演练，提升突破，答案解析等内容，欢迎下载使用。
一、前言（1分）
本套复习题聚焦中考英语三大核心语法点——冠词、名词、情态动词，涵盖考点讲解、基础巩固、真题演练、提升突破、综合测试五个模块。题目精选近三年（2023-2025）全国各省市中考真题，搭配原创新颖题型，旨在帮助考生系统梳理语法知识、掌握解题技巧、提升应试能力。请认真完成每一道题目，结合解析总结规律，助力中考取得优异成绩。
二、考点梳理与核心讲解
（一）冠词（考点权重：★★★）
1. 冠词的分类：定冠词（the）、不定冠词（a/an）、零冠词（不用冠词）。
2. 核心用法：
（1）不定冠词a/an：① 泛指某类人或事物中的一个；② 用于第一次提到的人或事物前；③ 表示“每一”（相当于per）；④ 用于固定搭配中（如have a gd time, take an umbrella）。注意：a用于辅音音素开头的单词前，an用于元音音素开头的单词前。
（2）定冠词the：① 特指某类人或事物中的特定一个或一些；② 用于双方都知道的人或事物前；③ 用于序数词、最高级前；④ 用于世界上独一无二的事物前（如the sun, the mn）；⑤ 用于乐器、姓氏复数前（表一家人）；⑥ 用于江河湖海、山脉群岛等专有名词前。
（3）零冠词：① 用于复数名词、不可数名词泛指时；② 用于专有名词（人名、地名、节日名等）前；③ 用于三餐、球类运动前；④ 用于固定搭配中（如g t schl, at hme）。
3. 易错点提示：① 区分“元音字母”与“元音音素”（如an hur, a university）；② 冠词在固定搭配中的特殊用法；③ 泛指与特指的语境判断。
（二）名词（考点权重：★★★★）
1. 名词的分类：可数名词（个体名词、集体名词）、不可数名词（物质名词、抽象名词）。
2. 核心用法：
（1）可数名词的单复数：① 规则变化（加-s/-es/-ies等，如bks, bxes, cities）；② 不规则变化（如child-children, muse-mice, sheep-sheep）；③ 集体名词的单复数（如family作“家庭”讲为单数，作“家人”讲为复数）。
（2）不可数名词：① 无复数形式，表达数量需借助“数词+量词+f”结构（如a cup f water, tw bttles f milk）；② 常见不可数名词（如advice, infrmatin, news, weather, prgress等）。
（3）名词所有格：① 单数名词直接加’s（如Tm’s bk）；② 以s结尾的复数名词加’（如students’ classrm）；③ 两者共有的所有格，只在后一个名词后加’s（如Lucy and Lily’s mther）；④ 两者各自的所有格，两个名词后都加’s（如Lucy’s and Lily’s bags）。
3. 易错点提示：① 易混淆的可数与不可数名词辨析；② 不规则复数形式的记忆；③ 名词所有格在具体语境中的应用。
（三）情态动词（考点权重：★★★★）
1. 常见情态动词：can/culd, may/might, must/have t, shuld/ught t, will/wuld, need等。
2. 核心用法：
（1）can/culd：① 表能力（culd为can的过去式，语气更委婉）；② 表许可（culd比can更礼貌）；③ 表推测（can用于否定句、疑问句，culd可用于肯定句、否定句、疑问句）。
（2）may/might：① 表许可（might比may语气更委婉）；② 表推测（might比may可能性更低）；③ 表祝愿（如May yu succeed!）。
（3）must/have t：① must表主观“必须”，否定式为mustn’t（禁止）；② have t表客观“不得不”，否定式为dn’t have t（不必）；③ must表推测，用于肯定句，语气强烈。
（4）shuld/ught t：表建议、义务，意为“应该”，ught t后需接介词t。
（5）will/wuld：① will表意愿、将来；② wuld为will的过去式，表过去的意愿，也可用于委婉请求。
（6）need：可作情态动词（用于否定句、疑问句，后接动词原形）或实义动词（后接t d，否定式为dn’t need t d）。
3. 易错点提示：① 不同情态动词表推测时的语气差异与用法限制；② mustn’t与dn’t have t的区别；③ 情态动词的委婉语气在交际语境中的应用。
三、专项巩固练习
（一）冠词专项（每小题1分，共20分）
Ⅰ. 选择填空
1. （原创）—D yu knw ________ girl in red ver there? She wn ________ first prize in the English speech cntest.
—Yes, she’s my classmate, Mary.
A. a; the B. the; the C. the; a D. a; a
2. （原创）________ 8-year-ld by saved three peple frm the river yesterday. He is ________ her in ur city.
A. An; a B. A; an C. The; a D. An; the
3. （2025·山东济南中考）—What ________ useful bk it is!
—Yeah, it tells us hw t prtect urselves in ________ face f danger.
A. a; the B. an; the C. a; a D. an; a
4. （2024·广东广州中考）We usually have ________ breakfast at 7:00 a.m., and then g t ________ schl.
A. the; the B. a; a C. /; / D. the; /
5. （2023·江苏苏州中考）My father plays ________ pian well, but he desn’t like playing ________ basketball.
A. the; the B. /; the C. the; / D. /; /
6. （原创）________ Great Wall is ne f the mst famus places f interest in ________ China.
A. The; / B. A; / C. The; the D. A; the
7. （原创）—Wuld yu like ________ cup f tea?
—Yes, please. And I prefer ________ tea with milk.
A. a; the B. a; / C. the; a D. the; /
8. （2025·湖北武汉中考）—When is ________ Natinal Day?
—It’s n Octber 1st. We usually have ________ 7-day hliday.
A. /; a B. the; a C. /; an D. the; an
9. （原创）He ges t wrk by ________ bike every day, but tday he tk ________ taxi because f the rain.
A. /; a B. a; a C. /; the D. a; the
10. （2024·浙江杭州中考）________ sun rises in ________ east and sets in ________ west.
A. The; the; the B. A; an; a C. The; an; the D. A; the; a
Ⅱ. 用适当的冠词（a/an/the）或零冠词填空，每空一词
11. （原创）My mther is ________ dctr. She wrks in ________ hspital near ur hme.
12. （原创）________ first lessn f ur mrning is English. It’s ________ interesting subject.
13. （2025·四川成都中考）We had ________ wnderful time at ________ party last night.
14. （原创）________ ld man ver there has been teaching in this schl fr ________ past 20 years.
15. （原创）I usually read ________ bk befre ging t bed. Last night I read ________ interesting strybk.
16. （2024·湖南长沙中考）—D yu knw ________ girl wh is talking t ur teacher?
—Yes, she’s ________ exchange student frm Canada.
17. （原创）________ mn mves arund ________ earth, and ________ earth mves arund ________ sun.
18. （原创）He plays ________ ftball very well. He wants t be ________ ftball player in the future.
19. （2023·安徽中考）This is ________ useful dictinary. I bught it in ________ bkstre n Nanjing Rad.
20. （原创）We will have ________ exam next week. We shuld study hard fr ________ exam.
（二）名词专项（每小题1分，共30分）
Ⅰ. 选择填空
1. （原创）There are many ________ in the z. I like ________ best because they are s cute.
A. animal; panda B. animals; pandas C. animal; pandas D. animals; panda
2. （2025·河北中考）—Hw many ________ d yu have?
—Three. They are my uncle, my aunt and my cusin.
A. family member B. family members C. family’s member D. family’s members
3. （原创）Please give me tw ________ f ________. I want t make fruit salad.
A. bx; apple B. bxes; apple C. bxes; apples D. bx; apples
4. （2024·河南中考）—What’s yur favrite ________?
—I like math best. It helps me develp my lgical thinking.
A. subject B. sprt C. fd D. clr
5. （原创）The ________ f the city is very beautiful at night. Many ________ cme t visit it every year.
A. scenery; turist B. sceneries; turists C. scenery; turists D. sceneries; turist
6. （2023·陕西中考）—Whse ________ are these?
—They are Lucy’s. She left them in the classrm.
A. pen B. pencil C. eraser D. bks
7. （原创）We need sme ________ t make a cake. Culd yu buy sme frm the supermarket?
A. egg B. milk C. tmat D. ptat
8. （2025·福建福州中考）The ________ f the meeting is t discuss hw t imprve ur study efficiency.
A. purpse B. prblem C. prduct D. prgress
9. （原创）There are three ________ in ur ffice. They are all hard-wrking.
A. wman teacher B. wmen teacher C. wman teachers D. wmen teachers
10. （2024·辽宁沈阳中考）—I gt a lt f ________ frm my teachers and parents when I was in truble.
—That’s why yu culd get ut f the truble s quickly.
A. advice B. advices C. suggestin D. suggestin
Ⅱ. 用所给名词的适当形式填空
11. （原创）There are many ________ (child) playing n the playgrund. They are all very happy.
12. （2025·江西中考）My mther bught tw ________ (bttle) f ________ (juice) fr me this mrning.
13. （原创）The ________ (student) in Class One are preparing fr the ________ (cme) sprts meeting.
14. （原创）There are three ________ (knife) and fur ________ (frk) n the table. They are fr the dinner.
15. （2024·贵州贵阳中考）Please give me sme ________ (infrmatin) abut the summer camp. I want t jin it.
16. （原创）The ________ (family) in this cmmunity are very friendly t each ther.
17. （原创）We shuld prtect the ________ (envirnment) and make ur ________ (earth) a better place t live in.
18. （2023·云南昆明中考）My father has many ________ (hbby), such as cllecting ________ (stamp) and playing chess.
19. （原创）The ________ (sheep) n the grassland are eating grass. They lk very fat.
20. （原创）There are sme ________ (tmat) and ________ (ptat) in the basket. Let’s make vegetable salad.
Ⅲ. 用所给名词的所有格形式填空
21. （原创）This is ________ (Lucy) bk. The ne n the desk is ________ (Lucy and Lily).
22. （2025·甘肃兰州中考）________ (Tm and Jim) father is a dctr. He wrks in a big hspital.
23. （原创）The ________ (children) tys are all in the bx. They ften play with them after schl.
24. （原创）Tday is ________ (Teacher) Day. Let’s send ur best wishes t ur teachers.
25. （2024·海南海口中考）The ________ (library) pening time is frm 8:00 a.m. t 5:00 p.m.
26. （原创）My ________ (grandma) huse is near the park. We ften visit her n weekends.
27. （原创）The ________ (student) answers are very gd. The teacher praised them in class.
28. （2023·宁夏银川中考）This is ________ (Mary) and ________ (Jane) bedrm. They share it tgether.
29. （原创）The ________ (dg) tail is shrt. It lks very lvely.
30. （原创）The ________ (tw by) bags are n the chair. They frgt t take them.
（三）情态动词专项（每小题1分，共30分）
Ⅰ. 选择填空
1. （原创）—________ I brrw yur dictinary? I left mine at hme.
—Sure, here yu are.
A. Must B. Need C. May D. Shuld
2. （2025·黑龙江哈尔滨中考）—________ yu swim when yu were 5 years ld?
—N, I culdn’t. But nw I ________ swim very well.
A. Can; can B. Culd; can C. Culd; culd D. Can; culd
3. （原创）Yu ________ crss the rad when the traffic light is red. It’s very dangerus.
A. mustn’t B. needn’t C. shuldn’t D. wuldn’t
4. （2024·吉林长春中考）—The bk ________ be Lucy’s. Her name is n the cver.
—Yes, yu’re right.
A. must B. can C. may D. might
5. （原创）—I have a headache. What ________ I d?
—Yu ________ see a dctr and have a gd rest.
A. shuld; must B. must; shuld C. can; shuld D. shuld; can
6. （2023·内蒙古呼和浩特中考）—________ I finish the wrk tday?
—N, yu ________. Yu can finish it tmrrw.
A. Must; needn’t B. Must; mustn’t C. Need; mustn’t D. Need; needn’t
7. （原创）It’s raining heavily utside. We ________ stay at hme instead f ging ut.
A. wuld B. shuld C. might D. culd
8. （2025·新疆乌鲁木齐中考）—Wuld yu like t g t the cinema with me tnight?
—I’d lve t, but I ________. I have t finish my hmewrk.
A. can’t B. mustn’t C. needn’t D. shuldn’t
9. （原创）Yu ________ be quiet in the library. Everyne is reading carefully.
A. may B. can C. must D. culd
10. （2024·青海西宁中考）—Where is Tm?
—He ________ be in the classrm. I saw him there just nw.
A. need B. must C. might D. can
Ⅱ. 用适当的情态动词填空
11. （原创）—________ yu speak French?
—N, I ________, but I ________ speak English very well.
12. （2025·西藏拉萨中考）Yu ________ nt play with fire. It’s very dangerus.
13. （原创）—________ I use yur phne? Mine is ut f pwer.
—Of curse yu ________.
14. （原创）The grund is wet. It ________ have rained last night.
15. （2024·广西南宁中考）Yu ________ take an umbrella with yu. It ________ rain this afternn.
16. （原创）—________ we g t the park this weekend?
—Gd idea! We ________ have a picnic there.
17. （原创）He ________ nt cme t the party tnight because he has t lk after his sick mther.
18. （2023·广东深圳中考）—Must I hand in my hmewrk nw?
—N, yu ________. Yu ________ hand it in befre tmrrw mrning.
19. （原创）She ________ play the pian when she was 6 years ld. Nw she ________ play mre difficult pieces.
20. （原创）________ yu like t drink sme cffee? It’s very delicius.
Ⅲ. 根据句意改写句子，用适当的情态动词替换划线部分
21. （原创）It’s necessary fr yu t finish yur hmewrk befre watching TV. （改为含情态动词的句子）
Yu ________ finish yur hmewrk befre watching TV.
22. （2025·湖南株洲中考）Perhaps he will cme t the meeting n time. （改为含情态动词的句子）
He ________ cme t the meeting n time.
23. （原创）It’s nt allwed t smke in public places. （改为含情态动词的句子）
Yu ________ smke in public places.
24. （原创）I suggest yu ask the teacher fr help when yu have prblems. （改为含情态动词的句子）
Yu ________ ask the teacher fr help when yu have prblems.
25. （2024·浙江宁波中考）It’s impssible that he is late fr schl. He always gets up early. （改为含情态动词的句子）
He ________ be late fr schl. He always gets up early.
26. （原创）I am able t finish the wrk in tw hurs. （改为含情态动词的句子）
I ________ finish the wrk in tw hurs.
27. （原创）It’s a gd idea fr us t take a walk after dinner. （改为含情态动词的句子）
We ________ take a walk after dinner.
28. （2023·江苏无锡中考）Yu dn’t need t wrry abut him. He can take care f himself. （改为含情态动词的句子）
Yu ________ wrry abut him. He can take care f himself.
29. （原创）Maybe she has frgtten the meeting. （改为含情态动词的句子）
She ________ have frgtten the meeting.
30. （原创）It’s necessary fr us t prtect the envirnment. （改为含情态动词的句子）
We ________ prtect the envirnment.
四、真题综合演练（每小题2分，共40分）
1. （2025·北京中考）—I saw ________ film yesterday. It’s abut ________ interesting stry f a by and his dg.
—Really? I want t see it t.
A. a; an B. an; a C. the; an D. a; the
2. （2025·上海中考）________ Smiths are ging t have a picnic in the park this weekend. They invited us t jin them.
A. A B. An C. The D. /
3. （2024·天津中考）There are many ________ in the supermarket. They sell different kinds f ________.
A. shp; fd B. shps; fds C. shp; fds D. shps; fd
4. （2024·重庆中考）—Whse ________ is this?
—It’s my ________. He bught it last week.
A. watch; father’s B. watches; father C. watch; father D. watches; father’s
5. （2023·安徽中考）—________ I use yur pen? Mine is brken.
—Certainly. Here yu are.
A. Need B. May C. Must D. Shuld
6. （2023·福建中考）—The light in the rm is n. Wh ________ be in it?
—It ________ be Tm. He said he wuld cme back late tnight.
A. can; must B. must; can C. might; can D. can; might
7. （2025·湖北襄阳中考）—What ________ useful advice yu gave me!
—Yu’re welcme. I hpe it can help yu.
A. a B. an C. the D. /
8. （2025·湖南岳阳中考）There are three ________ and five ________ in the picture.
A. sheep; deer B. sheep; deers C. sheeps; deer D. sheeps; deers
9. （2024·广东中考）Yu ________ be careful when yu crss the rad. The traffic is very busy at this time.
A. can B. may C. must D. culd
10. （2024·浙江中考）—________ I finish the reprt tday?
—N, yu ________. But yu ________ finish it by Friday.
A. Must; needn’t; must B. Must; mustn’t; can C. Need; needn’t; can D. Need; mustn’t; must
11. （2023·江苏中考）—D yu knw ________ girl in the blue dress?
—Yes, she’s my sister’s friend. She’s ________ university student.
A. a; an B. the; a C. the; an D. a; the
12. （2023·山东中考）The ________ f the new building is very mdern. Many ________ will wrk here next year.
A. design; wrker B. designs; wrkers C. design; wrkers D. designs; wrker
13. （2025·四川中考）—Where is my English bk?
—It ________ be n yur desk. I saw it there a mment ag.
A. must B. can C. might D. shuld
14. （2025·陕西中考）We usually have ________ dinner at 6:30 p.m., and then we d ________ hmewrk.
A. the; the B. /; / C. /; ur D. the; ur
15. （2024·辽宁中考）These are ________ ________. They are very beautiful.
A. Lucy; flwers B. Lucy’s; flwer C. Lucy’s; flwers D. Lucys’; flwers
16. （2024·吉林中考）—Yu ________ run in the hallway. It’s dangerus.
—Srry, I wn’t d it again.
A. mustn’t B. needn’t C. shuldn’t D. culdn’t
17. （2023·黑龙江中考）—Hw much ________ des yur mther need t make the cake?
—Tw spns.
A. sugar B. eggs C. apples D. tmates
18. （2023·内蒙古中考）—________ yu please pass me the salt?
—Sure, here yu are.
A. Must B. Shuld C. Culd D. Need
19. （2025·新疆中考）________ Great Wall is ________ lngest wall in the wrld.
A. The; the B. A; a C. The; a D. A; the
20. （2025·海南中考）—My brther ________ speak three languages.
—Ww, that’s amazing! What languages can he speak?
A. can B. must C. may D. shuld
五、提升突破（每小题3分，共30分）
1. （原创）—I heard ________ unusual stry frm my grandfather yesterday. It’s abut ________ life f fishermen in the past.
—Really? Culd yu tell it t me?
A. a; the B. an; the C. an; a D. a; a
2. （原创）The ________ f the cmpany decided t give all ________ a three-day hliday t celebrate the success f the prject.
A. manager; wrker B. managers; wrker C. manager; wrkers D. managers; wrkers
3. （原创）—________ the students ________ wear schl unifrms n weekdays?
—Yes, they ________. It’s a schl rule.
A. Must; /; must B. Need; t; need C. Must; t; must D. Need; /; need
4. （原创）There are sme ________ n the table. The ________ is fr my little sister.
A. apple; red ne B. apples; red ne C. apple; red nes D. apples; red nes
5. （原创）—Where is Jack?
—He ________ be in the library. He ________ g there every afternn t read bks. But I’m nt sure.
A. must; can B. might; can C. must; shuld D. might; shuld
6. （原创）—________ I use yur cmputer t send an email? Mine is being repaired.
—Srry, yu ________. I’m using it t finish my wrk nw. But yu ________ use my brther’s. He’s nt using it.
A. May; can’t; can B. Must; needn’t; can C. May; mustn’t; shuld D. Need; can’t; shuld
7. （原创）The ________ f the tw ________ is my uncle. He’s a famus dctr.
A. lder; man B. lder; men C. ldest; man D. ldest; men
8. （原创）—What d yu think f ________ film “The Wandering Earth 3”?
—It’s ________ wnderful film. I watched it twice.
A. the; a B. a; the C. the; an D. a; a
9. （原创）Yu ________ nt tell anyne abut this secret. It’s between yu and me. If yu tell thers, it ________ cause a lt f truble.
A. must; may B. can; must C. need; might D. shuld; can
10. （原创）There are many ________ in the ________. They are wrking hard t prtect the animals.
A. zkeeper; z B. zkeepers; z C. zkeeper; zs D. zkeepers; zs
六、答案解析
（一）冠词专项
Ⅰ. 选择填空
1. B 解析：第一空特指“穿红衣服的女孩”，用定冠词the；第二空后接序数词first，用定冠词the。故选B。
2. A 解析：8-year-ld是以元音音素开头的单词，用不定冠词an；第二空泛指“一个英雄”，her是以辅音音素开头的单词，用不定冠词a。故选A。
3. A 解析：useful是以辅音音素开头的单词，用不定冠词a；in the face f是固定搭配，意为“面对”。故选A。
4. C 解析：have breakfast和g t schl都是固定搭配，三餐和球类运动前用零冠词。故选C。
5. C 解析：play the pian是固定搭配，乐器前用定冠词the；play basketball是固定搭配，球类运动前用零冠词。故选C。
6. A 解析：the Great Wall是专有名词，用定冠词the；China是国家名称，用零冠词。故选A。
7. B 解析：第一空泛指“一杯茶”，用不定冠词a；第二空后的tea是泛指，用零冠词。故选B。
8. A 解析：Natinal Day是节日名称，用零冠词；7-day是以辅音音素开头的单词，用不定冠词a。故选A。
9. A 解析：by bike是固定搭配，交通工具前用零冠词；take a taxi是固定搭配，泛指“一辆出租车”，用不定冠词a。故选A。
10. A 解析：the sun, the east, the west都是世界上独一无二的事物或方位名词，前用定冠词the。故选A。
Ⅱ. 用适当的冠词或零冠词填空
11. a; a 解析：第一空泛指“一名医生”，dctr是以辅音音素开头的单词，用a；第二空泛指“一家医院”，hspital是以辅音音素开头的单词，用a。
12. The; an 解析：第一空后接序数词first，用the；第二空泛指“一门有趣的学科”，interesting是以元音音素开头的单词，用an。
13. a; the 解析：have a wnderful time是固定搭配；第二空特指“昨晚的派对”，用the。
14. The; the 解析：第一空特指“那边的老人”，用the；in the past 20 years是固定搭配，用the。
15. a; an 解析：第一空泛指“一本书”，用a；第二空泛指“一本有趣的故事书”，interesting是以元音音素开头的单词，用an。
16. the; an 解析：第一空特指“正在和我们老师说话的女孩”，用the；第二空泛指“一名交换生”，exchange是以元音音素开头的单词，用an。
17. The; the; the 解析：the mn, the earth, the sun都是世界上独一无二的事物，前用the。
18. /; a 解析：play ftball是固定搭配，球类运动前用零冠词；第二空泛指“一名足球运动员”，用a。
19. a; the 解析：useful是以辅音音素开头的单词，用a；第二空特指“南京路上的书店”，用the。
20. an; the 解析：第一空泛指“一场考试”，exam是以元音音素开头的单词，用an；第二空特指“下周的考试”，用the。
（二）名词专项
Ⅰ. 选择填空
1. B 解析：many后接可数名词复数，animal的复数是animals；panda是可数名词，此处用复数pandas表泛指。故选B。
2. B 解析：hw many后接可数名词复数，family member的复数是family members。故选B。
3. C 解析：tw后接可数名词复数，bx的复数是bxes；apple是可数名词，此处用复数apples表泛指。故选C。
4. A 解析：根据答语“math”可知，问句询问的是“科目”，subject意为“科目”；sprt运动；fd食物；clr颜色。故选A。
5. C 解析：scenery是不可数名词，无复数形式；many后接可数名词复数，turist的复数是turists。故选C。
6. D 解析：根据are these可知，此处用可数名词复数，pen, pencil, eraser都是单数，bks是复数。故选D。
7. B 解析：sme后接不可数名词或可数名词复数，egg, tmat, ptat都是可数名词单数，milk是不可数名词。故选B。
8. A 解析：purpse目的；prblem问题；prduct产品；prgress进步。根据句意“会议的目的是讨论如何提高我们的学习效率”可知，选A。
9. D 解析：wman teacher的复数是wmen teachers，当man/wman修饰复数名词时，man/wman也要用复数。故选D。
10. A 解析：advice是不可数名词，无复数形式；suggestin是可数名词，此处用复数suggestins。a lt f后接不可数名词或可数名词复数，故选A。
Ⅱ. 用所给名词的适当形式填空
11. children 解析：many后接可数名词复数，child的复数是children。
12. bttles; juice 解析：tw后接可数名词复数，bttle的复数是bttles；juice是不可数名词，无复数形式。
13. students; cming 解析：根据are可知，student用复数students；cming作定语，意为“即将到来的”。
14. knives; frks 解析：three和fur后接可数名词复数，knife的复数是knives，frk的复数是frks。
15. infrmatin 解析：infrmatin是不可数名词，无复数形式。
16. families 解析：根据are可知，family用复数families，此处指“社区里的家庭”。
17. envirnment; earth 解析：envirnment和earth都是不可数名词，无复数形式。
18. hbbies; stamps 解析：many后接可数名词复数，hbby的复数是hbbies；stamp是可数名词，此处用复数stamps表泛指。
19. sheep 解析：sheep的单复数同形，根据are可知，此处用复数sheep。
20. tmates; ptates 解析：sme后接可数名词复数，tmat的复数是tmates，ptat的复数是ptates。
Ⅲ. 用所给名词的所有格形式填空
21. Lucy’s; Lucy and Lily’s 解析：第一空指“露西的书”，用Lucy’s；第二空指“露西和莉莉共有的书”，只在后一个名词后加’s。
22. Tm and Jim’s 解析：此处指“汤姆和吉姆共有的父亲”，只在后一个名词后加’s。
23. children’s 解析：children的所有格是children’s，指“孩子们的玩具”。
24. Teachers’ 解析：Teachers’ Day是固定搭配，意为“教师节”。
25. library’s 解析：此处指“图书馆的开放时间”，library的所有格是library’s。
26. grandma’s 解析：此处指“奶奶的房子”，grandma的所有格是grandma’s。
27. students’ 解析：此处指“学生们的答案”，student的复数是students，所有格是students’。
28. Mary; Jane’s 解析：此处指“玛丽和简共有的卧室”，只在后一个名词后加’s。
29. dg’s 解析：此处指“狗的尾巴”，dg的所有格是dg’s。
30. tw bys’ 解析：此处指“两个男孩的包”，tw bys的所有格是tw bys’。
（三）情态动词专项
Ⅰ. 选择填空
1. C 解析：根据句意“我可以借你的字典吗？我把我的忘在家里了”可知，此处表请求，用may。must必须；need需要；shuld应该。故选C。