Unit4 I used to be afraid of the dark语法知识点及练习（无答案）人教版九年级全册

英语人教版2024年秋九unit4
I used to be afraid of the dark.
短语总结
1.used to do 过去常常做 2.deal with 对付 应付
3.be proud of 为…骄傲 ，感到自豪 4.take pride in 为……感到自豪
5.from time to time 时常，有时 6.in public 公开地
7.in person 亲身，亲自 8.take up sth 开始做，接受，占用
9.not……anymore 不再 10.worry about 为……担忧
11.hang out 闲逛 12.think about 考虑
13.be alone 独处 14.on the soccer team 在足球队
15.no longer 不再 16.make a decision 做决 定
17.to one’s surprise 令某人吃惊的是 18.even though 尽管
19.pay attention to 对……注意，留心 20.in the last few years 在过去的几年里
21.be afraid of 害怕 22.turn red 变红
23.tons of attention 很多关注 24.be careful 当心
25.give up 放弃 26.a very small number of …极少数的……
27.give a speech 作演讲 28.all the time 一直 总是
29.be interested in 对……感兴趣 30.change one’s life 改变某人的生活
31.take care of 照顾 32.one of … …之一
用法集萃
1.used to do sth 过去常常做某 2.be afraid of doing sth 害怕做某事
3.have to do sth 必须做某事 4.make sb do sth 让某人做某事
5.give up doing sth 放弃做什么 6.try to do sth 尽力做某事
7.adj+ enough to do sth 足够…而能够做某事 8.be prepared to do sth 准备做某事
9.see sb doing sth 看见某人在做某事 10.begin to so sth 开始做某事
11require sb to do sth 要求某人做某事 12.decide to do 决定做某事
13.make a decision to do sth 决定做某事 14.It’s hard to believe that …很难相信……
15.It +has+been +一段时间+ since+从句 自从……以来已经有很多 长时间了
16.dare to do sth 敢于做某事 17.It’s adj+ for sb+ to do sth对某人来说做某
18.take up doing sth 开始做某事
语法总结
一 Mario, you used to be short ,didn’t you 马里奥，你过去很矮，是吗？
used to “过去常常”，后接动词原形
表示过去经常反复发生的的动作或存在的状态（现在已经不复存在）
He used to play basketball at school. 他过去常常在学校里打篮球。
He used to walk to school. 他过去常常步行去上学。
I didn’t use to be quiet. 我过去不是很文静。
辨析：used to do sth, be used to doing sth. 与be used to do sth.
used to do sth. 意为“过去常常做某事”， 只用于过去时态 He used to go to sleep at 9 o’clock in the evening.他过去常常在晚上9点钟睡觉。
be used to doing sth. 意为“习惯于做某事”，可用于现在、过去、将来等多种时态 He is used to going to sleep early. 他习惯于早睡。
be used to do sth. 意为“被用于做某事”，是被动语态，不定式表目的，用于多种时态 Wood is used to make houses. 木材被用来造房子。
本句是一个反意疑问句，反意疑问句的特点是“前否后肯”“前肯后否”，而且附加问句中的动词在时态、人称和数等方面必须与前半句的动词相呼应。
You are a student , aren’t you 你是个学生，对吗
We can’t take books out, can we 我们不能把书拿出去，对吗？
【拓展】
反意疑问句的回答
①回答反意疑问句和回答一般疑问句结构一样，若答语是肯定的，用“Yes+肯定结构”；如果答语是否定
的，则用“No+否定结构”。
--He enjoys singing, doesn’t he 他喜欢唱歌，是吗？
--Yes, he does./No, he doesn’t. 是的，他喜欢。/不，他不喜欢。
② 回答陈述部分为否定句的反意疑问句时，yes 或no 的汉语意思与词义相反。
--You didn’t go to school, did you 你没有去上学，是吗？
--Yes, I did./No, I didn’t . 不，我去了。/是的，我没有去。
二Candy told me that she used to be really shy and took up singing to deal with her shyness.
坎迪告诉我她过去非常害羞，于是开始唱歌来对付她的羞怯。
take up “开始做”，通常指开始某项工作、某个爱好等，尤其指做以前从未做过的事或作为消遣的事。
take up doing sth. 意为“开始做某事”
He is going to take up a hobby like painting. 他打算培养一个爱好，如绘画。
My father took up learning English at the age of forty. 我的父亲在40 岁时开始学英语。
deal with “对付；应付”。
He has learnt to deal with all kinds of difficulties. 他已经学会了应对各种困难。
辨析：deal with 与do with
三 For this month’s Young World magazine, I interviewed 19-year-old Asian pop star Candy Wang.
为了这个月的《年轻世界》杂志，我采访了19岁的亚洲明星坎迪王。
interview此处用作及物动词，“采访；会见”。
We are going to interview the manager of this company. 我们要采访这家公司的经理。
【拓展】
interview还可用作名词，“面试；访谈”。
The film star agreed to give an interview after his wedding. 那位电影明星同意在他举行婚礼后接受采访。
19-year-old是一个形容词，“19岁的”，它是由“数词+名词+形容词”构成的，中间用连字符连接，其中的名词用单数形式。
an eight-year-old girl 一个8岁的女孩
He is a ten-year-old boy. 他是一个10岁的男孩。
Asian形容词，“亚洲的，亚洲人的”。
How many Asian countries have taken part in the sports meeting 有多少亚洲国家参加这次运动会？
【拓展】
Asian还可用作名词，意为“亚洲人”。
As she got better,she dared to sing in front of her class, and then for the whole school.
当她变得更好一些时，她敢于在全班同学面前唱歌，然后为全校唱歌。
dare 为实义动词，“敢于；胆敢”。
dare to do sth. “敢于做某事”，其中to 有时可以省略（尤其是在否定句或疑问句中）
We must dare to think , speak and act. 我们必须敢想、敢说、敢做。
He doesn’t dare to say anything. 他什么也不敢说。
We all know she was wrong, but none of us dared to tell her.我们都知道她错了，但我们没有一个人敢对她说。
in front of “在……前面”。
There is a little child in front of the house. 房子有一个小孩子。
辨析：in front of 与in the front of
in front of 在……的前面 强调在某一物体外部的前面
in the front of 在……的前部 强调在某一物体内部的前面
whole形容词，“整个的，全部的”，常用结构为“the+whole+名词单数形式”。all 也有此意，但语序不同，all用于冠词、所有格或其他限定词之前；whole用于冠词、所有格及其他限定词之后。
I spent the whole morning/all the morning in bed today. 今天我整个早上都在床上。
Now she’s not shy anymore and loves singing in front of crowds.
现在她不再羞怯了，并且很喜欢在观众面前唱歌。
not...anymore“不再”，anymore也可作any more。Not...anymore相当于no more, 一般指动作或行为不再重复出现。
Jim didn’t live here anymore.=Jim no more lived here. 吉姆不再住在这儿了。
crowd此处用作名词，“人群；观众”。
There were crowds of people at the theater. 剧院里聚着一群一群的人。
We had to push the way through the crowd. 我们不得不从人群中挤过去。
【拓展】
① crowd还可作动词，“拥挤”。
They all crowded into the cinema. 他们全都挤进了电影院。
② crowded 为形容词，“拥挤的”。
The shop is crowded on weekends. 在周末这家商店很拥挤。
六 I didn’t use to be popular in school, but now I get tons of attention everywhere I go.
我过去在学校里不受欢迎，但是现在我去哪里都受到极大关注。
tons of“大量的，许多的”，后接可数名词复数形式或不可数名词。
They’ve got tons of money. 他们腰缠万贯。
I bought tons of apples while they were cheap. 我趁这个苹果便宜的时候买了许多。
七 However, too much attention can also be a bad thing.然而，太多的关注也可能是一件坏事。
too much“太多的”，后接不可数名词。
He has too much homework to do. 他有太多的家庭作业要做。
辨析：too much, much too与too many
too much 修饰不可数名词，意为“太多的” There is too much noise in the classroom. 教室里有太多的噪音。
much too 修饰形容词或副词，意为“太” The book is much too dear. 这本书太贵。
too many 修饰可数名词复数形式，意为“太多的” There are too many passengers on the bus. 公交车上有太多的乘客。
八、I always have to worry about how I appear to others, and I have to be very careful about what I say or do.我总是不得不为怎样出现在别人面前而担忧，并且我必须注意我说的话和我所做的事。
worry about “为……担心，为……担忧，为……烦恼”。
She always worries about some little things. 她总是为一些小事而烦恼。
Don’t worry about your son and he is well. 不要为你的儿子担心，他很健康。
【拓展】
worry 的过去分词可转化为形容词使用，构成be worried about，相当于worry about。
Mothers are always worried about their children.=
Mothers always worry about their children. 母亲们总是为她们的孩子担心。
九 Hanging out with friends is also impossible for me now because there are always guards around me.
现在对我来说和朋友们一起闲逛几乎是不可能的，因为在我的周围总是有警卫。
hang out“闲逛；闲荡”。
Where does he hang out these days 这些日子他都在什么地方闲逛？
guard 此处用作可数名词，“守卫，警卫”。
The camp guards are changed every night. 营区的守卫每夜都更换。
【拓展】
guard还可用作动词，“防守；警戒；看守”。
The dog guarded the house.
十 ...you have to be prepared to give up your normal life.
……你必须准备好放弃你的正常生活。
be prepared to do sth. “准备好做某事，愿意做某事”。
I am prepared to take the exam. 我为考试做好了准备。
【拓展】
be prepared of “为……做好准备”。
give up“放弃”，其后可接名词、代词或动词-ing形式作宾语。give up是动副型短语，后接代词作宾语时，应将代词放在give和up之间。
We should never give up hope. 我们应该永不放弃希望。
English is very important. Don’t give it up. 英语很重要，不要放弃它。
I will never give up doing sports because I hope I will be healthier.我永远不会放弃运动，因为我希望我会更加健康。
十一 Many times I thought about giving up, but I fought on.
许多次我考虑放弃，但我继续战斗。
fight on “继续战斗”。其中on为副词，表示动作的继续。句中fought是fight的过去式。
We must fight on until the end. 我们必须斗争到底。
【拓展】
on 还常用于以下短语中：
go on 继续
move on 继续向前
walk on 继续走
work on 继续工作
keep on 继续；坚持不懈
十二 You really require a lot of talent and hard work to succeed.
你真的需要很多才艺和努力工作才能取得成功。
require及物动词，“需要；要求”，其后可接名词、代词或不定式复合结构作宾语。
The job requires strength. 这份工作需要体力。
Do you require anything else 你还需要什么吗？
They required us to help them. 他们要求我们帮助他们。
【拓展】
requirement名词，“需要，要求”。
The most important requirement is to speak English well. 最重要的要求是讲好英语。
十三 Only a very small number of people make it to the top.
只有很少一部分人做到最好。
a very small number of “极少数……”；后接复数名词，在句中作主语，谓语动词用复数形式。
a number of意“许多……，大量”；
a small number of “少数……”。
A small number of people can answer the question. 少数人能回答这个问题。
辨析： a number of 与 the number of
a number of 许多…… 主语时复数名词，谓语动词须用复数形式
the number of ……的数量 主语是the number ，谓语动词须用单数形式
A number of apples are red. 许多苹果是红色的。
The number of students is 2,000. 学生的数量是2,000。
十五 It is hard to believe that he used to be a “problem child” until a conversation with his parents influenced his way of thinking.很难相信他过去是一个“问题少年”，直到一次和他的父母的谈话影响了他的想法。
It is hard to believe that +从句 表示“很难相信……”。it 是形式主语， that从句是真正的主语。
It’s hard to believe that she’s only nine. 很难相信她只有9岁。
His teacher’s words influenced him for all his life. 他的老师的话影响了他的一生。
The weather influences the crops. 天气影响农作物。
【拓展】
influence还可用作名词，“影响，作用”。
have an influence on sb.“对某人有影响”。
His idea had a great influence on me. 他的想法对我的影响极大。
十六 As a small child, he seldom gave his parents any problems, and they were proud of him.
当他小的时候，他很少给他的父母惹任何麻烦，并且他们以他为骄傲。
seldom 频度副词，“不常；很少”。在句中用于连系动词、助动词或情态动词之后，实义动词之前。
He seldom eats breakfast. 他很少吃早饭。
be proud of “为……骄傲/感到自豪”。其中proud为形容词，意为“骄傲的；自豪的”，
其名词形式为pride，意为“骄傲；自豪”。
His family are proud of him. 他家人为他感到自豪。
【拓展】
be proud to do sth. “为做某事感到骄傲/自豪”。
He is proud to be a student of Tsinghua University. 他为成为一名清华大学的学生而感到骄傲。
十七 Li Wen began to cause problems for himself and his family. 李文开始自己和家人惹麻烦。
cause动词，“导致，使发生”，后面可跟双宾语。
cause problems,意为“惹麻烦，引起麻烦”。
What caused him to quit his job 是什么原因使他辞职的呢？
The heavy snow caused the accident. 大雪造成了这场事故。
十八 He was no longer interested in studying. 他不再对学习感兴趣。
no longer “不再”，表示某种状态在某个时刻之后不再继续下去了。在句中通常放在行为动词的前面，连系动词、情态动词或助动词的后面。no longer 相当于not...any longer。
Mary is no longer a student.=Mary isn’t a student any longer.玛丽不再是学生了。
He no longer lives here.=He doesn’t live here any longer. 他不再居住在这儿了。
十九 He was often absent from classes, and he failed his examinations. 他经常缺课，并且考试不及格。
absent为形容词，“缺席；不在”，常与介词 from连用。
They were absent from work that day. 他们那天没有上班。
【拓展】
absence名词，“缺席，不在”。
The decision was made in my absence. 这个决定是我不在的时候做出的。
fail此处用作及物动词，“未能通过”；也可作不及物动词，因此fail examination（考试不及格）也可表示为fail in examination。
Bob always fails in his examinations. 鲍勃总是考试不及格。
【拓展】
fail也可跟动词不定式， fail to do sth.意为“未能/没能做某事”。
I failed to pass the driving test. 我未能通过驾驶考试。
二十 Finally, his parents made a decision to send him to a boarding school.
最后，他的父母决定送他去寄宿学校。
make a decision “做决定；下决心”。
其中decision为名词，意为“决定，决心”，
其动词形式为decide，意为“决定；下决心”。
make a decision相当于decide, 其用法为：make a decision to do sth.=decide to do sth. “决定做某事”。
He made a decision to learn medicine.=He decided to learn medicine. 他决定学医。
【拓展】
make a decision中的decision前面可以被其他形容词修饰，如good,big,important,final,difficult等。
My friend made a difficult decision. 我的朋友做出了一个艰难的决定。
二十一 The head teacher advised his parents to talk with their son in person.
校长建议他的父母亲自和他们的儿子谈谈。
advise sb. to do sth. “建议某人做某事”。
The boss advised him to leave as soon as possible.老板建议他尽快离开。
He advised me to buy a computer. 他建议我去买一台电脑。
【拓展】
advise doing sth. “建议做某事”。
He advised leaving early. 他建议早动身。
in person意为“亲身；亲自”。
I will go to fetch it in person. 我将亲自去取它。
You should ask him in person. 你应该亲自去问他。
二十二 His parents took a 40-hour train ride and a five-hour bus ride to go back to their hometown.
他的父母乘坐40个小时的火车和5个小时的公共汽车回到了他们的家乡。
a 40-hour train ride“乘火车40个小时的路程”。
a five-hour bus ride“乘公共汽车5个小时的路程”。
40-hour是由“数字+连字符号+名词（单数）”构成的复合形容词，在句中作定语。
类似的还有：
the 70-year history70年的历史；
a four-day holiday 4天的假期；
a five-year plan一个五年计划
二十四 They also told me that even though they couldn’t be there to take care of me, they were always thinking of me and would take in everything good that I did.
他们还告诉我尽管他们不能在那儿照顾我，但他们总是想着我，并且为我做过的每一件好事而感到自豪。
even though “尽管，即使，纵然”，有退一步设想的意味，相当于even if，多用于书面语中。
He went on working with his assistant even though both of them were tried.
尽管他们两个都累了，他仍然和他的助手继续工作。
take care of“照看，照顾”，相当于look after.“好好照顾”可用take good care of 或look after...well表示。
You must take good care of yourself and keep healthy.=You must look after yourself well and keep healthy.
你一定要好好照顾自己，保持健康。
【拓展】
take care “小心，注意”。同义短语是be careful和look out，三者可互换。
Take care! It’s dangerous here. 小心!这儿危险。
be always doing sth. “总是做某事”，常用于表达说话人的某种情绪，如赞扬、不满、责备等。
He was always asking his parents for money. 他总是向父母要钱。
She is always thinking of her work. 她总是想着她的工作。
take pride in “为……感到自豪”，in 为介词，其后可接名词、代词或动词-ing形式。相当于be proud of。
The young mother took pride in her son.=
The young mother was proud of her son. 这个年轻的妈妈为她的儿子感到自豪。
二十五 He has been working hard and is now one of the best students in his class.
他一直努力学习，现在是班上最好的学生之一。
“one of the +形容词的最高级+复数名词”“最……的……之一”。
Changjiang River is one of the longest rivers in the world. 长江是世界上最长的河流之一。
习题检测
一单项选择
1. — Only a small number of students 　　　　 able to pass the exam.
— Yes. The number 　　　　 no more than 20.
A. is; is B. are; is C. is; are D. are; are
2.—Mike , you’ve got so many beautiful stamps .
—Yeah. I collect stamps when I was 8 years old .
A was used to B used to C am used to D used
3.Our hometown a lot in the last few years .
A changed B has changed C is changing D changes
4.Zhang Lin used to in the daytime , but now he is used to at night .
A read , read B reading , read C read , reading D reading , reading
5.Every year a lot of tourists travel to Hainan , because it’s island .
A so a beautiful B so beautiful C such a beautiful D a such beautiful
6.There a swimming pool here .
A used to have B was used to be C used to be D is used to having
7.I used to play soccer and I was the soccer team .
A / , in B the , on C a , on D / , on
8.His teacher advised his parents with their son .
A talk B talking C talked D to talk
— you take a bus to school
—Yes . But now I usually walk to school .
A Did , use to B Were , used to C Do , use t o D Do, used to
10.He won’t dare his promise .
A break B to break C breaking D breaks
11.I saw him to the shop with his cousin just now .
A goes B go C to go D went
12.The dinning hall is to hold 300 people.
A.enough big B.enough small C.small enough D.big enough
13.It’s been three years we last saw our primary school classmates.
A.since B.for C.until D.after
14.She is girl from Asia.
A.a 18-year-old B.an 18-year-old C.an 18-years-old D.a 18-years-old
15.—Many students don’t know how to difficulties and become worried.
—I think they should ask the teacher for help.
A.play with B.deal with C.talk with D.come up with
16.I didn’t use to be popular in school,but now I get attention everywhere I go.
A.tons of B.very C.much too D.a lot
17.Though he is at home,he doesn’t feel for he has many things to do.
A.alone,lonely B.lonely,alone C.alone,alone D.lonely,lonely
18.—Mom,I was the first to reach the top of the mountain.
—Good job,Jack. I’m of you.
A.careful B.proud C.tired D.afraid
19.Lucy used to go to bed late, she
A.didn’t B.doesn’t C.hadn’t D.isn’t
20. our surprise,the ground is covered with snow.
A.By B.To C.For D.In
21.We all take in Liu Yang,the great astronaut.
A.pride B.prides C.proud D.proudly
22.My brother is not old enough after himself.
A.look B.looking C.to look D.looked
23. — Baseball is a popular game among students in Taipei.
— Really But it’s unpopular in our city. Students play it.
A. often B. seldom C. usually D. always
24.However, attention can also be a bad thing.
A.too much B.much too C.too many D.many too
26.Our teacher advises us ________ a lot of books to improve our study.
A．to read B．reading C．reads D．read
27.They arrived ________ Shanghai ________ a cold morning.
A．in; in B．in; on C．at; on D．at; in
28 I don’t know 　　　　 to deal with them.
— Calm down first. Let’s see what I can do for you.
A. what B. why C. who D. how
29. — Andy says his team will win the cup in the final.
— I am sure they will 　　　　.
A. pass it B. keep it C. catch it D. make it
30 — Do you often e-mail your friends
— No. I use WeChat more often, but I 　　　　 e-mail my friends.
A. have to B. would like to C. used to D. get to
31 — Look! The goldfish is dying.— What a pity! This kind of goldfish 　　a lot of care and attention.
A. has B. offers C. requires D. receives
32. — James, can you tell me 　　　　
------. He used to be a shy and quiet boy.
A. what is Paul like B. what Paul is like C. what does Paul like D. what Paul likes
33 —Why do you work so hard
— Because I hope I can make my parents 　　　　 me. I don’t want to let them down.
A. take pride in B. take care of C. be strict with D. be afraid of
34. — You should say sorry to your father for the mistake you made, Tom.
— I don’t 　　　　 to meet his eyes. What if he gets angry with me
A. need B. have C. refuse D. dare
35. — This place used to be full of trees, 　　　　 it
— Yes. But now it has turned into buildings.
did B. didn’t C. was D. wasn’t
二用所给单词的适当形式填空
1.He got good on her exam . (score).
2.It’s interesting how people have changed . (see)
3.France is a country . (Europe)
4.After his parents to Guangzhou , his life changed .(move)
5.After that , he became more in history .(interest)
6.I spent much time on the Internet . (chat)
7.I used to ants and other insects when I was a child .(watch)
8.These things are for my life . (help)
9．I didn't use________ (be) popular.
10．He enjoys ________ (listen) to the radio.
11．I am afraid of ________ (go) out at night.
12．To be healthy, we should eat a lot of ________ (vegetable)．
13. Without hard work, it would be impossible for you 　　　　 (get) good grades in exams.
14. The hotel is 　　　　(exact) what we want. It’s a perfect one for us to stay in.
15 It’s high time that we made a 　　　　(decide). There is no need to discuss it anymore.
16.She is not strong enough (go) walking up ountains.
17.When I walked past the park,I saw some old pople (do) Chinese Kongfu.
18.Don’t give up (study) hard. Because you are a good student.
19.Finally,his parents made a decision (send) him to a boarding school.
20.He has been working hard and is now one of (good) student in his class.
21.My life (change) a lot in the last few years.
22.At last, he made an important (decide).
23.He didn’t dare (speak) in front of the people.
24．He is able ________ (travel) in the countryside.
25．He gave up ________ (drive)．
三. 按要求完成句子。
1. My parents often took a walk after supper in the past. (改写同义句)
My parents 　　　　 　　　　 　　　　 a walk after supper.
2. My uncle used to work in Sichuan. (改写成否定句)
My uncle 　　　　 　　　　 　　　　 work in Sichuan.
3. 我以前经常开车上班，但是现在我骑车。(完成译句)
I 　　　　 　　　　 　　　　 to work, but now I ride my bike.
4. 朱迪不再是一个害羞的女孩了。
Judy is 　　　　 a shy girl 　　　　.
5. 曹老师以前是不是教过历史？他历史知识真丰富。
Mr Cao 　　　　 　　　　 teach history He has so much knowledge of history.
3. 我开始从事培训志愿者工作已经一年了。
It has been a year since I 　　　　 　　　　 training volunteers.
4. 当志愿者让我的私人时间变少了，但是我的时间花在更有意义的事情上了。
Being a volunteer makes me 　　　　 　　　 time, but my time was spent on something more meaningful.
5. 面对这么多困难，我们决定继续奋斗，而不是放弃。
Facing so many difficulties, we’ve decided to 　　　　 　　　　 instead of 　　　　 　　　　.
四 从方框中选择合适的词组，并用其适当形式填空。
（be proud of, be absent from, all the time, in person, take care of，Europe introduce give up）
1. I am tired of working with numbers 　　　　　, so I give up my job as an accountant (会计).
2. The kind lady spends a lot of free time 　　　　　　　　 homeless cats and dogs.
3. I will not send the package byexpress (快递). I’ve decided to take it to Tom 　　　　　　　　.
4. Both Jim and his cousin 　　　　　　　　 the party yesterday. What a pity!
5. Every one of the club 　　　　　　　　 being a member of the great team.
.6 I have never thought of 　 　 my dream.
7. At the meeting, Mr. Wang began with a short 　 　.
8. This country is not a 　 　 country, though some parts of it are in Europe.
五、选词填空
( using , How , photos , their , spend , bring ,But ,easily ,with, what , better , paying)
Ten years ago , few people had mobile phones. But now , most people have 1 own mobile phones . With a mobile phone people can make phone calls 2 .Our life has changed a lot because of it . Chatting and message exchanging help people get to know each other 3 . You can even take 4 and send them to friends far away .
5 amazing ! And now we can do more and more things 6 it , such as playing games , getting and sending e-mails , surfing the Internet , or even 7 for what we buy . But there are some disadvantages . You have to pay the bill and it’s bad for your body if you keep 8 it for a long time . And for students , if they 9 too much time playing with it , they may not be able to study well .
In a word , mobile phones play an important role in our daily life . It’s helpful and necessary . 10 people , especially students , should use them properly .