第一篇：be是一个连系动词
be是一个连系动词，它有自己不同的形式
现在时：be 进行时：being 过去时：was/were 过去分词：been
它的后面必须跟形容词或名词作表语，与之构成系表结构，充当句子的谓语。
i am a student主语：i 谓语：am a student（系表结构）
being是它的现在进行时态，一般不单独用，而是用于现在进行时的被动语态。（being+动词过去分词）
the bike is being repaired.单车正在被修理中。
it is being finished by him这正在被他完成中。
been是它的过去分词，也不一般单独使用，而是用于现在完成时、过去完成时以及需要它的句子。
i have been here for a long time.我已经到这里有一段时间了。
至于你的问题，这与你想表达的意思有关。
你的工作是什么？
what do you do? what is your job? 那么这里选用do和is有什么根据呢？
第一句里面，第二个do是指你做什么，也就是你的工作，就是一个实义动词。按中文说，what you do已经足够了。可是英语里面就不行，必须跟一个助动词，也就是do.这里就有了一个结论：当句子中有动词时，我们就用助动词do或是does.如果没有动词时，我们就选用is或是are，也就是b“Be”除了原形的“be”之外，还有另外七种形式：am, is, are, been, being, was, were.在句子中，“be”可以是主动词(The Principal Verb)或助动词(The Auxiliary Verb).当主动词时，“be”在性质上属于接系动词(The Linking Verb), 后面要有名词、形容词、地方副词或短语作补足语(The Complement)。例如：
1.The man is a science teacher.2.Mary's new dresses are colourful.3.I have been there before.4.Mother is in the kitchen now.这四个都是陈述句，可以变成疑问句，方法简单，把主语和“be”或助动词对换位置即可：
5.Is the man a science teacher?
6.Are Mary's new dresses colourful?
7.Have I been there before?
8.Is mother in the kitchen now?
当“be”要在祈使句中出现时，它必须借重助动词“do”或“don't”之助，如：
9.Don't be silly!
10.Do be obedient!
11.Don't be a fool!
“Be”有两种缩写法，如下：
12.He's not...../He isn't....13.You're not...../You aren't...但“am + not”的缩写法只有一个：
14.I'm not.有人用“ain't”, 但这并不是标准英语。
谈过了“be”作主动词的功能，现在看看“be”作助动词时，有些什么用法：
1.“Be + 现在分词”以组成进行式时态(Continuous Tenses)，如：
15.Tony's maid is washing his new car.16.The children are playing in the field.17.Samuel was eating when I came in.18.We have been living here since 1959.2.“Be + 过去分词”以组成被动语态(The Passive Voice),如：
19.Her money in the drawer was stolen.20.A number of good jobs are taken up byforeigners.21.David studied in Taiwan but has been trained as a language lecturer in America.22.Can all the wonderful birds be found in our Bird Park?
23.The disobedient boy was told to stand out-side the classroom.24.Steps are being taken to reduce traffic con-gestion during peak hours.25.Dishonest students will be immediately dealt with.
第二篇：虚拟语气连系动词
基础语法小练
虚拟语气
用所给动词的适当形式填空：
1.If people ___________________(drive)more slowly, there wouldn’t be so many accidents.2.If you had worked carefully, you ___________________(not make)so many mistakes.3.The boat wouldn’t have drifted away, if we ______________________(tie)it up.4.If I had known you already _________________(have)a typewriter, I ___________________(not, buy)one
for your birthday.5.If he _________________(be)here this afternoon I would go with him.6.If it were to rain tomorrow, the match _________________(put off).7.But for your help, we ____________________(not be)able to finish the work in time.8.If it ___________________(not, be)for the leadership of the Party, we would not have achieved so much.9.I wish I __________________(study)hard while I was young.10.It is about time that fence __________________________(mend).11.My request is that we _____________________(hold)another session to discuss the problem.12.It is strange that the car ________________(break)down at exactly the same place where it
___________________(break)down yesterday.13.The baby smiled as if he ____________________(understand)what his mother ______________(say).14.He talked as if he ________________(do)all the work himself, but in fact Tom and I _________________(do)
most of it.15.If only we _____________________(have)a phone!I’m tired of queuing outside the public phone box.16.-----“Can we come in late tomorrow?”
-----“I’d rather you _____________(come)in on time.”
17.He looks as if he _________________(be)ill for a long time.18.He always talks as though he _____________________(address)a public meeting.19.If a metal ___________________(heat), it will expand.20.I _________________(stay)home if it rains this evening.选择题：
1.If I _______ you, I’d join the army.A.amB.wasC.wereD.would be
2.“If the sun ______ tomorrow, what would we do?”
A.will not riseB.would not riseC.did not riseD.does not rise
3.If you ______ to see Mary, what would you tell her?
A.areB.will be goingC.mustD.were
4.I would have said “Hello” to him if I ______ your brother.A.could seeB.had seenC.will seeD.will have seen
5.If you had wanted to buy a record, what ________?
A.would you buyB.had you boughtC.would you have boughtD.would you be buying
6.If the tablets had dissolved, John ______.A.would probably dieB.had probably died
C.probably would be diedD.would probably have died
7.________ if you had lost your watch?
A.Hadn’t you been upsetB.Wouldn’t you be upset
C.Weren’t you upsetD.Wouldn’t you have upset
8.-----“I was so sorry to hear about Jack.”
-----“If he had made more friends here, he might ________.”
A.have stayedB.have stayC.stayedD.stay
9.If I had a bike, I ______ it to you yesterday.A.would have lentB.would lend
C.would have lendD.could lend
10.____________, John would not have failed.A.If he has listened to meB.Had he listened to me
C.If he listened to meD.As he listened to me
11.Had Alice been more hardworking, she ________.A.had not failedB.would not have failed
C.would not failD.could not be failed
12.-----“Steve made a reservation already.”
-----“______ he change his mind, he can cancel it.”
A.ShouldB.WouldC.IfD.So
13.I wished it _______ but it did.A.occurred notB.did not accur
C.had not occurredD.would not occur
14.I _______ Professor Jones had taught me this equation.A.believeB.deeply thinkC.wishD.suppose
15.The sun rises in the east and sets in the west, so it seems as if the sun _____ around the earth.A.circlesB.is circlingC.be circlingD.were circling
16.The computer “teacher” was talking with his students as though it ______ a human teacher.A.wasB.wereC.had beenD.be
17.Jane appears as though she _______ the secret.A.knowsB.knewC.has knownD.had known
18.If only she _______ of Aunt Ruth!
A.was not terribly so frightenedB.were not terribly so frightened
C.be not so terribly frightenedD.were not so terribly frightened
连系动词(20)1.______________ __________________
3.___________/____________ __________/___________ ________________/_______________
5_____________ ______________ _________________ __________________ ________________
7________________________________________________________________________
______________________ _______________________________________________ __________________ Practice：
1.What he said sounds_______.A.nicelyB.pleasantlyC.friendlyD.wonderfully
2.We don’t care if a hunting dog smells _____, but we really don’t want him to smell_____.A.well, wellB.bad, badC.well, badlyD.badly, bad
3.He turned ____ ten years ago but later he became _____.A.a teacher;a doctorB.teacher;doctorC.teacher;a doctorD.a teacher;doctor
4.The dog _____lost yesterday.A.gotB.becameC.turnedD.fall
5.The old man must have ____ mad.A.goneB.turnedC.fallenD.driven
6.I felt ____ that I should leave.A.strongB.stronglyC.to be strongD.very strong
7.—Do you like the material?—Yes, it _____ very soft.A.is feelingB.feltC.feelsD.is felt
8.I am afraid the weather will _____ hot for a few days.A.lastB.be lastedC.stayD.be stayed
9.Although he has taken a lot of medicine, his health _____ poor.A.provesB.remainsC.maintainsD.continues
10.I love to go to the seaside in summer.It _____ good to lie in the sun or swim in the cool sea.A.doesB.feelsC.getsD.makes
11.The cloth that ___________ smooth and soft ___________.A.feels;sells wellB.feels;is well soldC.is felt;sells wellD.is felt;sells good
12.___________ delicious, the food was soon sold out.A.TastedB.Being tastedC.TastingD.To taste
13.Happy birthday, Alice!So you have ____________ twenty-one already.A.becomeB.turnedC.grownD.passed
14.The pilot asked all the passengers on board to remain ___________ as the plane was making a landing.A.seatB.seatingC.seatedD.to be seating
第三篇：英语中的连系动词用法
英语中的连系动词用法
一、连系动词基本用法
连系动词是表示不完全谓语关系的动词，它与其后的表语一起构成谓语。常见的连系动词有be(是)，become(成为)，get(变成)，remain(还是)，seem(似乎是)，look(看上去)，feel(感觉)等。连系动词后的表语通常是名词和形容词，有时也可以是代词、数词、副词、介词短语、不定式、动名词、从句等：
His English is excellent.他的英语很棒。(跟形容词)
He is a famous poet.他是著名诗人。(跟名词)
Money isn’t everything．金钱不是一切。(跟代词)
She was the first to arrive．她是第一个到达的人。(跟数词)
Who is upstairs? 谁在楼上？(跟副词)
He is with his friends.他和朋友在一起。(跟介词短语)
He seems to be ill.他似乎病了。(跟不定式)
Seeing is believing.眼见为实。(跟动名词)
This is what you need.这就是你需要的。(跟从句)
二、学习连系动词应注意的两点
1.关于连系动词后接副词作表语
连系动词后通常可接形容词作表语，一般不接副词：
误：His English is very well.他的英语很好。(应将well改为good)
误：Be carefully.小心点。(应将carefully改为careful)
误：The soup tastes nicely.这汤味道不错。(应将nicely改为nice)
但是，有时连系动词后也可接副词作表语，不过这主要限于in, on, off, out, away, behind, up, down, over, through, around, round, below, inside, outside 等少数副词小品词以及here, there, upstairs, downstairs等少数表示地点或方位的副词：
Mother wasn’t in last night.母亲昨晚不在家。
The meeting was over at five.会议五点结束。
Come along.The taxi is outside.来吧，出租车在外面。
Mother is downstairs waiting for you.母亲在楼下等你。
2.关于连系动词后接不定式
(1)连系动词be后根据情况可自由地接不定式作表语：
My dream is to be a scientist.我的梦想是当一名科学家。
All I could do was to wait.我只能等。
My plan was to go from London to Paris.我计划从伦敦去巴黎。
I was to have seen Mr.Kay.我本要去见凯先生的。
(2)seem, appear, prove, continue, turn out, get, grow, come 等连系动词后也可接不定式(尤其是to be)作表语：
She always seems to be sad.她常常显得很忧伤。
My advice proved to be wrong.我的意见证明是错的。
She appears to have many friends.他好像有很多朋友。
The weather turned out to be fine.天气结果很好。
Circumstances continue to be favorable.情况仍然是有利的。
He has grown to like studying English.他渐渐喜欢学英语了。
【注】若所接不定式为to be，通常可以省略。不过，若其后接的是表语形容词，则to be通常不宜省略。另外，连系动词look后能否接to be似乎尚有争论，不过，在现代英语中接to be的现象已较普遍。
(3)sound, smell, feel, taste, become等连系动词后通常不能接不定式：
误：These oranges taste to be good.(应去掉to be)
误：The roses smell to be nice.(应去掉to be)
(4)有的连系动词后接的从句可用不定式来改写：
It seems that she’s right./ She seems to be right.她似乎是对的。
It appears that you have made a mistake./ You appear to have made a mistake.似乎你弄错了。
英语连系动词的分类
(1)状态系动词：只有be一词。如：
She is always like that.她总是那样。
I am used to going about alone.我习惯于独来独往。
These shoes are too tight for me.这双鞋我穿太小。
(2)持续系动词：表示主语继续或保持一种状况或态度，主要有keep, remain, stay, rest, lie, stand。如：
I hope you’ll keep fit.我希望你身体好。
He always kept silent at meeting.他开会时总保持沉默。
The door remained closed.门仍然关着。
We can remain friends.我们可以继续做朋友。
Please stay seated.请继续坐着。
He stayed single.他仍然是单身。
(3)表像系动词：表示“看起来好像”，主要有seem, appear, look等。如：
He looks tired.他看起来很累。
He seems(to be)quite happy.他好像很快活。
The doctor seemed very capable.那医生似乎很能干。
He appeared quite well.他显得身体相当好。
He appeared taken aback.他似乎很吃惊。
She appeared perplexed.她显得迷惑不解。
(4)感官系动词：表示“„„起来”，有feel(摸起来，感觉), smell(闻起来), sound(听起来), taste(尝起来，吃起来)等。如：
This kind of cloth feels very soft.这种布摸起来很软。
He looks honest, but actually he’s a rogue.他看起来很老实，实际他是一个坏蛋。They all look alike to me.他们的模样我看起来都一样。
Everybody feels contented.每个人都感到很满足。
Ice feels cold.冰感觉起来是凉的。
Silk feels soft and smooth.丝绸摸起来很柔软平滑。
It sounds a good idea.这听起来是个好主意。
This food tastes good.这菜好吃。
【注意】：由于英语的系动词均“不及物”，所以它们不能用于被动语态。但是，值得注意的是，英语中表示感官的系动词，如feel(摸起来，感觉)，smell(闻起来)，sound(听起来)，taste(尝起来，吃起来)等，由于它们按汉语意思理解好像含有被动意义，很容易弄错。如：
玻璃摸起来是光滑的。
误：Glass is felt smooth.正：Glass feels smooth.析：汉语说“摸起来”，其实就是指“被摸起来”，似乎含有被动意义，很容易错用被动语态。
这牛奶闻起来有酸味了。
误：The milk is smelt sour.正：The milk smells sour.析：汉语说“闻起来”，其实就是指“被闻起来”，似乎含有被动意义，很容易错用被动语态。
(5)变化系动词：表示主语变成什么样，主要有become, grow, turn, fall, get, go, come, run如：
He became mad after that.自那之后，他疯了。
She had grown thinner and thinner.她越来越瘦了。
His cold was growing worse.他的感冒越来越严重了。
She’s growing fat.她正在发胖。
He’s grown used to it.他对此已经习惯。
When she saw this, she turned red.她看到这，脸红了。
His hair turned grey in a few weeks.在几个星期中他头发就变灰白了。
The milk will soon turn sour.牛奶很快就会变酸。
Several people fell ill, victims of blood poisoning.几个人生病了，都是血中毒的受害者。We get wiser as we get old.随着年岁的增长，我们也变得聪明些了。
Your hair has gone quite white!你的头发全白了!
She went pale at the news.听到这消息，她脸色变得苍白。
When I mentioned it to him he went red.我对他提及此事时他脸红了。
He went mad.他疯了(from)。
The children must not go hungry.孩子们不能挨饿。
(6)终止系动词：主要有prove, turn out(结果是，证明是)等。如：
His story proved false.他讲的情况原来是假的。
His advice proved sound.他的劝告证明是对的。
My intuition turned out to be correct.我的直觉证明是对的。
系动词可接哪些词语作表语
连系动词后的表语通常是名词和形容词，有时也可以是代词、数词、副词、介词短语、不定式、动名词、从句等。如：
1.用名词作表语。如：
Translation is an art.翻译是一种艺术。
Beijing is a beautiful city.北京是一座美丽的城市。
2.用形容词表作语。如：
Traveling is interesting but tiring.旅行是有趣的，但是使人疲劳。
Every hour and every minute is important.每一小时，每一分钟，都很宝贵。
3.用代词作表语。如：
My idea is this.我的想法是这样的。
Money isn’t everything.金钱不是一切。
His latest play is nothing.他最近出的那个剧本毫无价值。
4.用数词作表语。如：
Tom is 14.汤姆14岁。
Last check-in time is 20:15.最后检票时间为20点15分。
The average of letters received each month is 3,000.每月平均收到信件3,000封。
5.用副词作表语。如：
The secret is out.机密泄漏了。
Sales are down.销售量下降了。
She is off on Saturday.她星期六不工作。
6.用介词短语作表语。如：
Dinner is at six.6点钟开饭。
I hope he is on time.我希望他准时。
Martha still is in hospital.马撒还在医院里。
Diana was with the children.戴安娜和孩子们在一起。
You look like your sister.你模样像你姐姐。
7.用不定式作表语。如：
His goal is to be a doctor.他的目标是当医生。
My duty is to protect my sisters.我的职责是保护我的妹妹们。My advice to you is to speak the truth.我对你的忠告是讲真话。My dream is to travel around the world.我的梦想是环游世界。
8.用动名词作表语。如：
Her hobby is growing roses.她的爱好是种植玫瑰。
His job is looking after sheep.他的任务是看羊。
My favorite sport is swimming.我最喜欢的运动是游泳。
9.用从句作表语。如：
That’s what we are here for.我们来这里就为了这个。
The question is how he did it.问题是他是如何做此事的。
That’s where I first met her.那就是我第一次遇见她的地方。
The trouble is that I have lost his address.麻烦的是我把他的地址丢了。
第四篇：keep因为是一个系动词
keep因为是一个系动词,所以后面一般都只用ing形式,省略了on,完整的是keep on doing,不会有to do的形式,如果又,只有下面2种情况: 1.be kept to do.被动语态中后面用不定式,表目的.e.g.his salary has been kept to afford their new car.他把工资留着去买新车.2.keep 和 to do属于两个部分的成分
e.g.you should keep slim to make yourself a good madel.你应该保持身材才能做一个优秀的模特.keep的用法小结
keep是高考常考词汇之一，其含义丰富，与其搭配的短语也很多，其主要用法如下：
A、用作及物动词
（1）保留、保存、保持、留下
e.g.We'd better keep a seat for him.我们最好给他留个座位。
He kept all the money in the bank.他把所有的钱都存入了银行。
（2）履行（诺言）遵守
e.g.One should keep one's promise.一个人应当遵守自己的诺言。
Everybody must keep the law.人人都必须守法。
（3）赡养，养活，饲养
e.g.He has a large family to keep.他有一大家人要养活。
The old man kept many animals like dogs, pigs and cats.这位老人养了许多动物，像狗、猪、还有猫等。
（4）经营，管理
e.g.He kept a hotel in this city.在这座城市里，他开了一家旅店。
She is good at keeping house.她擅长管理家务。
（5）保守（秘密），记（日记、帐）
e.g.All of the people keep the Spring Festival in our country.我国所有的人都庆祝春节。
Some of them keep birthdays.他们中有些人庆祝生日。
（7）使……处于某种状态（情况）
在这种情况下，keep常跟复合结构（keep＋宾语＋补语）。用作宾语补足语常见的词有现在分词、过去分词、形容词、副词以及介词短语。
e.g.He kept me waiting for half an hour.他让我等了半个小时。
Keep your mouth shut and your eyes open.少说话，多观察。
The doctor kept me in for a week.医生一周没让我出去。
He always keeps his books in good order.他总是把书放得整整齐齐。
B、用作不及物动词
（1）保持、继续（处于某种状态）（keep为连系动词）
e.g.Please keep quiet.请保持安静。
We're keeping in very good health.我们身体非常好。
（2）（食物）保持良好状态
e.g.Will this fish keep till tomorrow?
这鱼能放到明天吗？
C、keep构成的一些短语
keep(sb.)away(from sth.)（使）某人离开（某物）
keep sb.from doing sth.阻止某人做某事
keep sth.in mind 记住（某事物）
keep sb./ sth.out(of sth.)不让……入内
keep back 忍住（眼泪），扣下，隐瞒
keep in touch with 与……保持联系
keep(on)doing sth.继续做某事
keep off 远离，避开，让开
keep up 保持（不低落），继续
keep up with 跟上，不落在后面
keep boarders.为寄宿生提供食宿
To raise:
抚养，饲养：
keep chickens.养鸡
To maintain for use or service: 备有：为利用或服务而持有：
a city dweller who didn't keep a car.没有汽车的城市居民 To manage, tend, or have charge of: 管理、照管或负责…：
Keep the shop while I'm away.我不在的时候你要照看商店
To preserve(food).保存（食物）
To cause to continue in a state, condition, or course of action: 维持：使…保持某一状态、情况或过程的动作：
attempted to keep the patient calm.试图使病人镇静
To maintain records in: 记载，记入：保存记录于：
keep a yearly diary.记载年纪
To enter(data)in a book: 记录（资料）于书里：
keep financial records.记录财务记录
To detain: 留住，耽搁：
was kept after school.放学后被留下来
To restrain: 控制：
kept the child away from the hot stove;kept the crowd back with barriers.别让孩子走近热炉子；用屏障挡住人群
To prevent or deter: 阻止，制止：
tried to keep the ice from melting.防止冰融化
To refrain from divulging: 使…不泄露：
keep a secret.保守秘密
To save;reserve: 保存；积攒：
keep extra money for emergencies.攒下多余的钱以备急用
To maintain: 保持：
keep late hours.经常晚睡
To adhere to;fulfill: 坚持；完成：
keep one's word;keep a busy schedule.履行诺言；按紧张的日程表完成 To celebrate;observe.庆祝；欢度
v.intr.（不及物动词）
To remain in a state or condition;stay:
保持，维持：保持某种状态或情况；保持：
keep in line;keep quiet;kept well.排好队；保持安静；保鲜
To continue to do: 继续做：
keep on talking;keep guessing.继续讲话；继续猜
To remain fresh or unspoiled: 保持新鲜或不腐败：
The dessert won't keep.沙拉不易久放
n.（名词）
Care;charge: 照顾；管理：
The child is in my keep for the day.今天这孩子由我照顾
The means by which one is supported: 生计：人生存所需物品：
earn one's keep.挣钱糊口
The stronghold of a castle.要塞：城堡的把守要点
A jail.监狱
keep at
To persevere in work or an action.坚持做…：继续某项工作或行为
keep down
To prevent from growing, accomplishing, or succeeding: 压制，镇压：阻止…成长、完成或成功：
keep down prices;keep the revolutionaries down.控制物价；镇压革命
keep off
To stay away from.躲开，避开
keep to
To adhere to: 坚持，信守：
keep to the original purpose.遵守原定宗旨
keep up To maintain in good condition: 保持良好状态：
kept up the property.保存财产
To persevere in;carry on: 保持；继续：
We asked her to stop talking, but she kept up.我们请她别再说话了，但她依旧说下去
To continue at the same level or pace.并行：按相同的水平或步伐继续下去
To match one's competitors, colleagues, or neighbors in success or lifestyle: 不落后，赶得上：赶上对手、同事或邻居，指在成就或生活方式上：
unsuccessfully tried to keep up with his associates.没能赶上他的同事们
for keeps
For an indefinitely long period: 永远地：无限长的一段时间：
gave the ring to me for keeps.把这个戒指永久性地送给了我Seriously and permanently: 严肃而永久地：
We're separating for keeps.我们从此一刀两断
keep an eye out To be watchful.警觉
keep company
To carry on a courtship: 相爱：
a couple who kept company but never married.彼此相爱却不结婚的一对情侣
keep(one's)chin up
To be stalwart, courageous, or optimistic in the face of difficulty.乐观，坚定：在困难面前坚定、勇敢或乐观
keep(one's)eyes open 或
keep(one's)eyes peeled To be on the lookout.警觉，小心
keep(one's)nose clean【非正式用语】
To stay out of trouble.避开麻烦
keep pace
To stay even with others, as in a contest.并列：与其他人并驾齐驱，如在比赛中
keep(someone)company To accompany or remain with.陪伴：陪伴或与…呆在一起
keep time
To indicate the correct time.显示准确时间
Music To maintain the tempo or rhythm.【音乐】 保持节奏或旋律
keep to(oneself)
To shun the company of others: 避开其他人的陪伴：
She kept to herself all morning.整个上午她自己一个人呆着
To refrain from divulging: 使…不泄露：
He kept the news to himself.他对这个消息秘而不宣
第五篇：怎样区别被动语态与“连系动词 be+过去分词”的结构
怎样区别被动语态与“连系动词 be+过去分词”的结构
“be+过去分词”并不一定都是被动语态，有时是系表结构。当“be+过去分词”表示动作时为被动语态，be是助动词，be后面的过去分词是主要动词，动作的对象是主语；当“be +过去分词”表示主语所处的状态时为系表结构，be是连系动词。be后面的过去分词是表语，相当于形容词。其区分办法如下：
1．如果强调动作或句中有介词by引导出动作的执行者，该句一般为被动语态，否则为系表结构。例如:
The glass is broken．玻璃杯碎了。（系表结构）
The glass was broken by the boy．玻璃杯被那男孩打碎了。（被动语态）
2．如果句中有地点、频率或时间状语时，一般为被动语态。如：
The magazine is published in Shanghai．这家杂志出版于上海。（被动语态）
The door is locked．门锁着。（系表结构）
The door has already/just been locked．门已经/刚刚被锁上。（被动语态）
The shop is opened．这家商店开门了。（系表结构）
The shop is opened at 8 a.m.everyday．这家商店每天上午八点开门。（被动语态）
3．被动语态除用于一般时态和完成时态外，还可以用于其他各种时态，而系表结构中的系动词be只有一般时态和完成时态。
所以下列句子都是被动语态：
The machine is being repaired．机器正在修。
A new school will be built here．这里将要建一所新学校。
点击咨询 