内容正文:
2026-2027学年冀教版八年级英语上册核心语法精讲精练
(新教材)Unit 8 Protecting the environment
核心语法:动词不定式作目的状语
一、核心概念
动词不定式作目的状语是用动词不定式 (to do) 来说明主句动作发生的目的、意图或原因,回答“为什么做这件事?”或“为了什么?”。
核心含义: “为了……” 、“以便……”
结构: 主语 + 谓语 + 其他 + to do(目的状语)
示例:
I went to the store to buy some milk.(我去商店是为了买牛奶。)
She studies hard to get good grades.(她努力学习是为了取得好成绩。)
常见中文翻译: “为了……”、“目的是……”
二、基本结构与位置
1. 最常见结构:放在句末
结构: 主语 + 谓语 + 宾语 + to do(目的)
I study hard to pass the exam.(我努力学习为了通过考试。)
She went to the library to borrow some books.(她去图书馆为了借书。)
We exercise every day to keep healthy.(我们每天锻炼为了保持健康。)
2. 强调目的:放在句首
将不定式放在句首,并用逗号与主句隔开,可以突出强调目的。
结构: To do(目的), + 主语 + 谓语 + 其他.
To pass the exam, he studies until midnight.(为了通过考试,他学习到深夜。)
To learn English well, you need to practice every day.(为了学好英语,你需要每天练习。)
To catch the early bus, I get up at 6:00.(为了赶上早班车,我6点起床。)
三、与“in order to”和“so as to”的对比
这三个表达都表示目的,但有细微差别:
表达方式
语气
位置
否定形式
to do
一般
句首、句中、句末均可
not to do
in order to do
更正式、强调
句首、句末
in order not to do
so as to do
较正式
通常放在句末
so as not to do
例句对比:
I came here to see you.(我来这里是为了看你。)
I came here in order to see you.(我来这里的目的是为了看你。)← 更正式、强调
He got up early so as to catch the train.(他早起以便赶上火车。)← 较正式
特别注意:
in order to 可以放在句首,so as to 通常不放在句首。
✅ To save money, I take the bus.
✅ In order to save money, I take the bus.
❌ So as to save money, I take the bus.(一般不这么用)
四、否定形式
1. not to do
He came not to help but to cause trouble.(他来不是为了帮忙,而是为了捣乱。)
I study hard not to disappoint my parents.(我努力学习是为了不让父母失望。)
2. in order not to do
She spoke quietly in order not to wake the baby.(她轻声说话是为了不吵醒婴儿。)
He left early in order not to be late.(他早早离开是为了不迟到。)
3. so as not to do
Walk quietly so as not to disturb others.(轻点走,以免打扰别人。)
He studied hard so as not to fail the exam.(他努力学习以免考试不及格。)
五、与“for + 名词/代词”表目的的区别
表达
结构
含义
例句
to do
to + 动词原形
为了做某事
I went there to meet my friend.
for sth.
for + 名词
为了某物/某事
I went there for a meeting.
for doing
for + 动名词
用于……的(常表功能)
This tool is for opening bottles.
详细对比:
to do vs for sth.
I went to the library to borrow books.(我去图书馆是为了借书。)
I went to the library for books.(我去图书馆是为了书。)
for doing(表示用途、功能)
This knife is for cutting bread.(这把刀是用来切面包的。)
A thermometer is for measuring temperature.(温度计是用来测量温度的。)
注意: for doing 通常不表示人的目的,而表示物体的用途或功能。
六、易错点与注意事项
1. 混淆目的状语与宾语
❌ I want going to Beijing.
✅ I want to go to Beijing.(不定式作宾语)
✅ I go to Beijing to visit the Great Wall.(不定式作目的状语)
区别:
作宾语:跟在及物动词后,是动作的对象。
作目的状语:表示动作的目的,可放在不同位置。
2. 与“so that”引导的目的状语从句混淆
简单句: I study hard to pass the exam.
复合句: I study hard so that I can pass the exam.
(两者意思相同,但结构不同:简单句 vs 复合句)
3. 不定式的逻辑主语
不定式的逻辑主语通常就是句子的主语。
He studies hard to go to a good university.(他努力学习是为了上好大学。)→ to go 的逻辑主语就是 He
4. 避免中式英语
❌ For to learn English well, I practice every day.
✅ To learn English well, I practice every day.
✅ In order to learn English well, I practice every day.
七、常见句型与情景应用
1. 表达个人目标
To become a doctor, she studies medicine.(为了成为医生,她学医。)
I practice basketball every day to join the school team.(我每天练习篮球是为了加入校队。)
2. 解释行为原因
He works overtime to earn more money.(他加班是为了赚更多钱。)
They came early to get good seats.(他们早来是为了占到好座位。)
3. 给出建议或指示
To improve your English, read more books.(为了提高英语,多读书。)
You should save money to buy a house.(你应该攒钱买房。)
4. 说明物体用途
We use a pen to write.(我们用笔来写字。)
This machine is used to make paper.(这台机器是用来造纸的。)
5. 表达决心或承诺
I will work hard not to let you down.(我会努力不让你失望。)
To protect the environment, we recycle waste.(为了保护环境,我们回收废品。)
八、在复合句中的使用
1. 与“enough to”连用
He is old enough to go to school.(他够大了,可以上学了。)
She ran fast enough to catch the bus.(她跑得够快,赶上了公交车。)
2. 与“too...to”连用(表示“太……而不能”)
He is too young to drive.(他太小了,不能开车。)
The box is too heavy to carry.(箱子太重了,搬不动。)
3. 与“so...as to”连用
He was so kind as to help the old man.(他很善良,帮助了那位老人。)
She worked so hard as to finish early.(她工作很努力,早早完成了。)
九、思维导图总结
十、记忆口诀
目的状语口诀:
不定式,表目的,to 加动词原形记;
句首句末都可以,强调目的放句首。
in order to 更正式,so as to 多句末;
否定前面加个 not,表达多样要灵活。
for 加名词为某物,doing 通常表用途;
区分宾语和目的,多做练习不迷糊。
1.We are all ready ________ our friends up when they feel sad.
A.to cheer B.for cheer C.at cheering D.with cheer
2.The doctor did all he could ________ the ________ man.
A.save; dead B.save; dying C.to save; dead D.to save; dying
3.Lucy checked her homework carefully ________ make mistakes.
A.in order that B.in order to C.in order not to D.in order to not
4.We are ready ________ share our favourite friendship songs with classmates.
A.to B.for C.at D.with
5.The doctor did everything he could ________ the patient.
A.save B.saving C.to save D.saved
6.________ finish the work early, we start to work at 7 o’clock in the morning.
A.In order B.In order to C.For order to D.To order
7.The doctor did everything he could ________ the patient.
A.save B.saving C.to save D.saves
8.I am always ready ________ my classmates with their study problems.
A.help B.to help C.helping D.helped
9.________ a true friend, you need to be a true friend first.
A.To have B.Having C.Have D.Had
10.Everyone should do as much as they can ________ the natural disasters ________ more comfortably.
A.stop; living B.stop; to live C.to stop; living D.to stop; to live
11.He often stayed up late ________ books.
A.read B.readed C.to read D.reads
12.Many students use tablets ________ in class.
A.learn B.learning C.to learn D.learned
13.Many wild animals are in danger. So we should make laws ________ them.
A.protect B.to protect C.protecting D.protected
14.He works hard ________ achieve his dream.
A.so that B.in order to C.because D.for
15.Some people want to change the wetlands ________ more space for farms and buildings.
A.make B.makes C.to make D.making
16.We use the internet ________ for information.
A.search B.searching C.to search D.to searching
17.________ as many people as possible, the firemen worked day and night.
A.Save B.Saved C.Saving D.To save
18.The museum was built ________ remember the war heroes.
A.for B.to C.at D.with
19.________ for the final exam, everybody works hard these days.
A.Review B.Reviewing C.To review D.Reviewed
20.He is working hard ________ get good grades in the exam.
A.in order to B.so that C.such that D.as that
21.We can use computers ________ our homework quickly.
A.finish B.to finish C.finishes D.finishing
22.We should take action ________ more forests for wildlife.
A.build B.to build C.building D.built
23.My mother gets up early every morning ________ breakfast for us.
A.make B.to make C.making D.made
24.—Why do you take up so many free-time activities?
—I do them ________ myself and enrich my life.
A.improve B.to improve C.improving D.improved
25.________ fit, people should exercise regularly and eat healthily.
A.Keep B.To keep C.Keeping D.Keeps
26.During the Yunnan City Football League, players from different teams did everything they could ________ the match.
A.win B.to win C.won D.winning
27.My mom takes me to ________ my eyes every year to make sure they’re healthy.
A.keep B.check C.take D.move
28.Many college students go to mountain villages in Yunnan ________ as volunteer teachers to help the children there.
A.work B.working C.worked D.to work
29.Mr Lee is an animal lover. He does everything he can ________ animals.
A.protect B.protected C.to protect D.protecting
30.My brother usually plays the flute ________ in his free time.
A.relax B.relaxes C.to relax D.relaxing
31.The students plant trees in the park every year ________ the environment.
A.will protect B.protects C.to protect D.protecting
32.She covered her nose __________ reduce the bad smell.
A.to B.so as to C.in order to D.All of the above
33.I like sharing my feelings with my best friends ________ stress.
A.reduce B.to reducing C.to reduce D.reducing
34.—Many people believe we can’t do anything when we face natural disasters?
—I don’t think so. We can still do a lot ________ them. For example, we can learn more knowledge about disasters.
A.Prepare for B.prepared for C.will prepare for D.to prepare for
35.The brave man risked his own life ________ others.
A.save B.saving C.to save D.saved
36.We need to put up some posters ________ more students to join the volunteer activity.
A.ask B.to ask C.asking D.asked
37.—What do you do in your free time?
—I play the piano ________.
A.relaxing B.to relax C.relax D.relaxed
38.He stayed up late ________ his sick cat last night.
A.look after B.to look after C.looking after D.looked after
39.The Russian people built the museum ________ remember the war.
A.to B.for C.at D.with
40.Gloria practiced shooting more than 100 times every day ________ her abilities.
A.improve B.to improve C.improving D.improved
41.—Sandy, several wild pigs appeared again in Nanjing!
—No worries. The government is taking action ________ them from hurting people.
A.protecting B.to protect C.protects D.protected
42.In order ________ the early bus, I didn’t stop ________ breakfast.
A.to miss; to buy B.not to miss; buying C.not miss; buying D.not to miss; to buy
43.He gets up early every morning ________ catch the first bus to school.
A.in order to B.so that C.such that D.in order that
44.She gets up early every morning ________ calligraphy.
A.practise B.practising C.to practise D.practises
45.________ get lost in the forest, we’d better take a compass with us.
A.In order to B.Don’t in order to C.In order not to D.In order to not
46.We should do what we can ________ hunters ________ animals.
A.to prevent; protecting B.to prevent; to protect C.prevent; protecting D.prevent; to protect
47.________ water, remember to turn off the tap at once after washing your hands.
A.Save B.Saving C.Saved D.To save
48.Everyone needs some free time ________ themselves from busy work or study.
A.relax B.to relax C.relaxing D.relaxed
49.We had better use cloth bags instead of plastic ones ________ protect the environment.
A.so that B.thanks to C.in order to D.in order that
50.[热点素材] China has made great efforts ________ the giant panda population increase in recent years.
A.help B.helped C.helping D.to help
51.—Mr Lee is an animal lover. He does everything he can ________ animals.
—I think we should learn from him.
A.protect B.protecting C.to protect D.to protecting
52.Parents always do whatever they can ________ a clean and comfortable environment for children.
A.provide B.to provide C.providing D.provides
53.In China, the whole family gets together ________ a reunion dinner on Chinese New Year’s Day.
A.have B.having C.to have D.had
54.Let’s get into the house ________ the heavy rain.
A.hide from B.to hide from C.hide off D.to hide off
55.We will hold a party ________ our teacher’s birthday next week.
A.celebrate B.to celebrate C.celebrating D.celebrated
56.The little girl made up her mind ________ hard to achieve her dream.
A.study B.to study C.studying D.studied
57.Could you give me a piece of paper ________?
A.to write B.to write down C.to write on D.to write with
58.I go to the stadium ________ exercise with my friend.
A.in B.with C.to D.at
59.________ the Dragon Boat Festival, our community will organize a zongzi-making competition.
A.Celebrating B.Celebrated C.To celebrate D.Celebrate
60.We should speak quietly __________ disturb others in the library.
A.to not B.not to C.so as not to D.in order not
参考答案及试题解析
1.A
【解析】句意:当我们的朋友感到难过时,我们都准备好让他们振作起来。
固定搭配be ready to do sth.意为“准备好做某事”,后面应接动词不定式to cheer。
2.D
【解析】句意:医生尽他所能去救那个垂死的人。
save救,动词原形;to save救,动词不定式;dead死的,形容词;dying垂死的,形容词。句中“he could”是修饰“all”的定语从句,第一空应填入动词不定式作目的状语,应选to save;第二空应是形容词修饰“man”,要去救的应该是“垂死的”人,而不是“死人”,应选dying。应填“to save; dying”。
3.C
【解析】句意:露西仔细检查了她的作业,为了不犯错误。
in order that为了,后接从句;in order to为了,后接动词原形;in order not to为了不,后接动词原形;in order to not为错误结构。根据“checked her homework carefully”可知,仔细检查作业目的是为了不犯错,且空后是动词原形make,应填in order not to。
4.A
【解析】句意:我们准备去和同学们分享我们最喜欢的友谊歌曲。
to去;for为了;at在;with和。固定短语“be ready to do sth.”意为“准备做某事”,后接动词原形,符合语境,应填to。
5.C
【解析】句意:医生尽他所能来救治病人。
save拯救(动词原形);saving拯救(动名词/现在分词);to save去拯救(动词不定式);saved拯救(过去式/过去分词)。句中he could为定语从句修饰everything,主句谓语为did,此处需用动词不定式to save作目的状语,表“医生尽一切努力去救病人”,符合语境。应填to save。
6.B
【解析】句意:为了早点完成工作,我们每天早上七点就开始工作。
In order后面必须加that再接从句(In order that+句子),不能直接加动词原形,排除;For order to不存在这个搭配,属于错误表达;To order订购、命令,放入句中语义不通。“finish the work early”是“we start to work at 7 o’clock in the morning”的目的。in order to do sth.“为了做某事”,固定短语,后接动词原形,符合语境。
7.C
【解析】句意:医生尽了他所能做的一切去挽救病人。
根据“The doctor did everything he could”可知,医生尽一切努力的目的是挽救病人,用动词不定式在句中作目的状语。故选用to save。
8.B
【解析】句意:我总是准备好帮助我的同学解决他们的学习问题。
固定搭配“be ready to do sth.”意为“准备好做某事”,空格处需用动词不定式。应填to help。
9.A
【解析】句意:要拥有一个真正的朋友,你首先需要成为一个真正的朋友。
根据题干“you need to be a true friend first”,空格处表示目的,应用不定式To have作目的状语。
10.D
【解析】句意:每个人都应该尽他们所能去阻止自然灾害,以便生活得更舒适。
固定句型“do as much as one can to do sth.”意为“尽某人所能去做某事”,此处用不定式表目的,第一空应填to stop;根据句意可知“阻止自然灾害”的目的是“为了生活得更舒适”,此处也用不定式表目的,第二空应填to live。
11.C
【解析】句意:他经常熬夜看书。
“He often stayed up late...books.”表明,熬夜的目的是看书,不定式作目的状语,故填to read。
12.C
【解析】句意:许多学生在课堂上使用平板电脑去学习。
use sth. to do sth.表示“使用某物去做某事”,此处表示使用平板电脑的目的,应用动词不定式。应填to learn。
13.B
【解析】句意:许多野生动物处于危险之中,因此我们应当制定法律来保护它们。
本句空格处用来表达制定法律的目的,动词不定式to do结构作目的状语,应填to protect。
14.B
【解析】句意:他努力工作为了实现他的梦想。
so that为了 (后接从句);in order to为了 (后接动词原形,表目的);because因为 (后接从句);for为了 (后接名词,表目的)。空格后是动词原形“achieve”,应用“in order to”表目的。
15.C
【解析】句意:有些人想要改变湿地,以便为农场和建筑腾出更多空间。
根据“Some people want to change the wetlands ... more space for farms and buildings.”可知,改变湿地的目的是为了腾出更多空间,应用动词不定式作目的状语。
16.C
【解析】句意:我们使用互联网来搜索信息。
search搜索;searching搜索(现在分词);to search去搜索(动词不定式);to searching错误结构。根据固定搭配“use sth. to do sth.”意为“使用某物去做某事”可知,此处应用动词不定式作目的状语。应填to search。
17.D
【解析】句意:消防员们日夜工作的目的是为了拯救尽可能多的人。
根据句意可知,消防员日夜工作的目的是为了拯救尽可能多的人,动词不定式置于句首表示目的。
18.B
【解析】句意:这座博物馆被建造是为了纪念战争英雄。
for为了;to为了;at在;with和。根据句意可知,建造博物馆的目的是纪念英雄,动词不定式作目的状语。
19.C
【解析】句意:为复习期末考试,这几天每个人都很努力。
根据“everybody works hard these days”可知,大家努力工作的目的是“为了复习”,动词不定式常置于句首作目的状语。应填To review。
20.A
【解析】句意:他正在努力学习,以便在考试中取得好成绩。
in order to为了,后接动词原形,表目的;so that后接句子,引导目的状语从句;such that结构错误;as that表述错误。get good grades是动词短语,应用in order to。
21.B
【解析】句意:我们可以用电脑快速完成我们的作业。
finish动词原形;to finish动词不定式;finishes动词三单;finishing动名词。固定搭配use sth. to do sth.表示“用某物去做某事”,此处用不定式作目的状语,故选to finish。
22.B
【解析】句意:我们应该采取行动为野生动物建造更多的森林。
固定搭配“take action to do sth.” 意为“采取行动做某事”,此处用动词不定式表示目的。
23.B
【解析】句意:我妈妈每天早上很早起床为我们做早餐。
根据“gets up early every morning...breakfast for us”可知,此处表示早起的目的,应用动词不定式作目的状语,故填to make。
24.B
【解析】句意:——你为什么参加这么多业余活动?——我做它们是为了提升我自己并丰富我的生活。
根据句意可知,此处表示参加活动的目的,应用动词不定式作目的状语。应填to improve。
25.B
【解析】句意:为了保持健康,人们应该规律锻炼并且健康饮食。
句中后半句是实现前半项目标的做法,不定式To keep作目的状语契合语境。
26.B
【解析】句意:在云南城市足球联赛期间,来自不同队伍的球员们尽他们所能去赢得比赛。
do everything one can/could to do sth.意为“尽某人所能去做某事”,此处用动词不定式作目的状语。故选B。
27.B
【解析】句意:我妈妈每年带我去检查眼睛以确保它们健康。
keep保持;check检查;take拿;取;move移动。根据“to make sure they’re healthy”可知,为了确保眼睛健康,需要去检查眼睛。应填check。
28.D
【解析】句意:许多大学生前往云南山村担任支教老师,去帮助那里的孩子。
固定结构“go to + 地点 + to do sth.”表示“去某地做某事”,动词不定式to work在此处作目的状语,说明前往山村的目的。
29.C
【解析】句意:李先生是一位动物爱好者。他尽一切所能去保护动物。
分析句子,“尽一切所能”的目的是“保护动物”,需用动词不定式作目的状语。
30.C
【解析】句意:我哥哥通常在空闲时间吹长笛来放松。
根据“plays the flute”和“in his free time”可知,吹长笛的目的是放松,应用不定式to relax作目的状语。
31.C
【解析】句意:学生们每年在公园种树以保护环境。
根据“The students plant trees in the park every year”可知,此处表示种树的目的,动词不定式在句中作目的状语,故填to protect。
32.D
【解析】句意:她捂住鼻子为了减少难闻的气味。
to不定式符号;so as to以便;in order to为了;All of the above以上全部。to、so as to、in order to后均接动词原形,表示“为了”,三者在本句中均符合语法和语境,故选以上全部。
33.C
【解析】句意:我喜欢和我最好的朋友分享我的感受来减轻压力。
根据“I like sharing my feelings with my best friends”以及“stress”可知,“我”和朋友们分享感受的目的是减轻压力,应用不定式to reduce作目的状语。
34.D
【解析】句意:——许多人认为面对自然灾害时我们无能为力?——我不这么认为。我们仍然可以做很多事情来为它们做准备。例如,我们可以学习更多关于灾害的知识。
根据语法规则,此处用动词不定式作目的状语,表示“为了做某事”。to prepare for意为“为…… 做准备”,符合语境。
35.C
【解析】句意:那个勇敢的人冒着生命危险去救别人。
分析句子结构可知,句中已有谓语动词“risked”,因此空格处需填入非谓语动词形式。根据语境,冒着生命危险的目的是救别人,表目的要用动词不定式“to+动词原形”结构。应选to save。
36.B
【解析】句意:我们需要张贴一些海报来邀请更多的学生加入志愿者活动。
根据“put up some posters”和“more students to join the volunteer activity”可知,张贴海报的目的是为了邀请更多学生加入,应用动词不定式作目的状语。
37.B
【解析】句意:——你空闲时间做什么?——我弹钢琴来放松。
根据句意可知,此处表示弹钢琴的目的是为了放松,应用动词不定式作目的状语。应填to relax。
38.B
【解析】句意:他昨晚熬夜照顾他生病的猫。
根据句意可知,熬夜的目的是照顾猫,应用不定式作目的状语,故选to look after。
39.A
【解析】句意:俄罗斯人民建造这座博物馆是为了纪念这场战争。
to动词不定式符号;for为了;at在;with和。根据“built the museum...remember the war”可知,建造博物馆的目的是为了纪念战争,动词不定式to do作目的状语,符合语境,故选A。
40.B
【解析】句意:Gloria每天练习射击超过100次为了提高她的能力。
根据“Gloria practiced shooting more than 100 times every day…her abilities”可知,每天练习射击的目的是为了提高能力,应用动词不定式作目的状语。应填to improve。
41.B
【解析】句意:——桑迪,南京又出现了几只野猪!——别担心。政府正在采取行动保护人们免受它们的伤害。
根据“The government is taking action”可知,此处考查固定搭配“take action to do sth.”,意为“采取行动做某事”,动词不定式表目的。
42.D
【解析】句意:为了不错过早班车,我没有停下来买早餐。
in order not to do sth.为了不做某事;stop to do sth.停下来去做某事,stop doing sth.停止正在做的事。根据“In order... the early bus”可知是为了不错过车,第一空用not to miss;根据“didn’t stop... breakfast”可知是没有停下来去买早餐,第二空用to buy。
43.A
【解析】句意:他每天早起为了赶上第一班去上学的公交车。
in order to为了(后接动词原形);so that为了(后接从句);such that如此以至于;in order that为了(后接从句)。根据空格后“catch”是动词原形可知,此处需要搭配动词原形表目的,应填in order to。
44.C
【解析】句意:她每天早上早起为了练习书法。
根据“gets up early every morning ... calligraphy”可知,早起的目的是练习书法,需用动词不定式作目的状语,应填to practise。
45.C
【解析】句意:为了不在森林里迷路,我们最好带个指南针。
in order to为了,后接动词原形;其否定形式是在to之前加not,即in order not to do sth.。根据句意可知带指南针是为了避免迷路,需用否定目的状语,In order not to符合语法与语境。
46.B
【解析】句意:我们应该尽我们所能去阻止猎人以保护动物。
根据固定搭配“do what one can to do sth.”意为“尽某人所能做某事”,可知第一空应填动词不定式to prevent,排除C、D选项;第二空表示阻止猎人的目的是为了保护动物,应用动词不定式to protect表目的,若填protecting 则构成“prevent sb. doing sth.”结构,意为“阻止某人做某事”,此处会变成“阻止猎人保护动物”,不符合逻辑。
47.D
【解析】句意:为了节约用水,洗手后记得立即关掉水龙头。
此处表示关掉水龙头的目的是为了节约用水,动词不定式置于句首表示目的,应填To save。
48.B
【解析】句意:每个人都需要一些空闲时间,从繁忙的工作或学习中放松自己。
根据“needs some free time”可知,此处表示需要空闲时间的目的是放松,动词不定式表目的,常用结构“need time to do sth.”意为“需要时间去做某事”,应填to relax。
49.C
【解析】句意:我们最好用布袋代替塑料袋,为了保护环境。
so that以便,后接完整句子,thanks to多亏,表原因,in order to为了,后接动词原形表目的,in order that为了,后接完整句子,空格后是动词原形protect,句子表达行动的目的,in order to符合语法与语境。
50.D
【解析】句意:近年来,中国做出了巨大努力去帮助大熊猫种群数量增加。
A项为动词原形,B项为过去式或过去分词,C项为现在分词或动名词,D项为动词不定式。固定短语make efforts to do sth.意为“努力做某事”,空处应用动词不定式。故选D。
51.C
【解析】句意:——李先生是一位动物爱好者,他竭尽所能保护动物。 ——我认为我们都应该向他学习。
根据“He does everything he can ... animals.”可知,他做所有力所能及的事情是为了保护动物。此处表示目的,应用动词不定式to do作目的状语。所以用“to protect”。
52.B
【解析】句意:父母总是尽他们所能为孩子们提供一个干净舒适的环境。
provide提供(动词原形);to provide提供(动词不定式);providing提供(动名词或现在分词);provides提供(动词第三人称单数形式)。根据“Parents always do whatever they can...a clean and comfortable environment for children.”可知,父母竭尽所能的目的是为了提供环境,此处用动词不定式作目的状语。
53.C
【解析】句意:在中国,全家人聚在一起吃新年的团圆饭。
have是动词原形,不能在句中作目的状语;having是现在分词;to have为动词不定式,用来表示目的;had是过去式。家人团聚的目的是吃团圆饭,此处用不定式表目的,应选用to have。
54.B
【解析】句意:让我们进屋躲避大雨吧。
hide from躲避;hide off无此搭配;句中用不定式to do作目的状语,表示进屋的目的是躲雨,应填to hide from。
55.B
【解析】句意:下周我们将举办一个聚会来庆祝我们老师的生日。
根据“We will hold a party...our teacher’s birthday”可知,举办聚会的目的是为了庆祝老师生日,应用动词不定式作目的状语。
56.B
【解析】句意:这个小女孩下定决心努力学习以实现她的梦想。
固定搭配make up one’s mind to do sth.意为“下定决心做某事”,此处应用动词不定式to study作目的状语。
57.C
【解析】句意:你能给我一张纸写字吗?
不定式修饰paper作定语,write与paper存在逻辑上的介宾关系,需加介词on连接,介词不可省略,排除A;write down后接内容,排除B;write with后接工具,排除D。
58.C
【解析】句意:我和朋友去体育场锻炼。
in在……里面;with和……一起;to动词不定式符号,表目的;at在(小地点)。根据句中“exercise(锻炼)”可知此处表去体育场的目的是锻炼;to后接动词原形表行动目的。
59.C
【解析】句意:为了庆祝端午节,我们社区将组织一场包粽子比赛。
根据“our community will organize...”可知,句子主干完整,句首处表示举办比赛的目的,应用动词不定式作目的状语。
60.C
【解析】句意:我们应该轻声说话,以免在图书馆打扰到别人。
to not不(错误否定格式);not to不去;so as not to为了不;in order not为了不(缺少to,结构不完整)。此处表目的“为了不打扰别人”,so as not to为完整正确的目的否定结构,其余选项格式残缺或用法错误。
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