Credit cards can be used to buy expensive things 这句中 be起到的作用是什么?什么情况下用be
作者&投稿：欧阳和 （若有异议请与网页底部的电邮联系）
致：出口部经理
我们正在寻找价格最适宜的 5.53和7.94a(型号)的挂钩，我们每月需要需要10000到15000片(件)，全部现金交易，尽可能给出你们最满意的价格，这样我们可以在新的一年里开始合作。
谢谢
P.kumar
个人感觉应该如此断句：
We looking for 5.53 and 7.94a hooks what the best price
we need 10000 to 15000 pcs per month
all cash
give your best rate possible
so that we can start business in the new year.
希望回答对你有帮助
study hard at English
work hard on English
有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)
语态也是动词的一种形式，表示主语与谓语之间的关系。英语有两种语态：主动语态和被动语态。主动语态表示主语是谓语动作的执行者，如：People grew rice in this area some years ago.被动语态表示主语是谓语动作的承受者，如：A new swimming pool will be built on our school.
(II)被动语态的构成
被动语态的形式是由“助动词be+动词的过去分词”构成。助动词be随着主语的人称，数，时态和语气的不同而变化。各种时态的被动语态形式如下：
1.一般现在时 am/is/are+V(p.p)
人们利用电能运转机器。People use electricity to run machines. Electricity is used to run machines.
Is electricity used to run machines? Yes, it is . / No, it isn’t.
2.一般过去时 was/were + V(p.p)
昨天我们在山坡上种了许多树。We planted many trees on the hill yesterday.
Many trees were planted on the hill yesterday.
Were many trees planted on the hill yesterday? Yes, they were. / No, they were not.
3.一般将来时 will/shall +be+V(p.p)
下星期我们将举行一场运动会。We will hold a sports meeting next week.
A sports meeting will be held next week.
Will a sports meeting be held next week? Yes, it will. / No, it won’t.
4.过去将来时 should/would +be+V(p.p)
他告诉我们人们将在他家乡建一个大水坝。He told us that people would build a big reservoir in his
hometown.
We were told that a big reservoir would be built in his hometown.
Were you told that a big reservoir would be built in his hometown? Yes, we were./No, we weren’t.
5.现在进行时 am/is/are +being+V(p.p) 语法学习纲要由江苏省靖江高级中学外语组为英语猫网站编写
他正在油漆房子。He is painting the house. A house is being painted.
Is the house being painted? Yes, it is. / No, it isn’t .
6.过去进行时 was/were +being+V(p.p)
当我进厨房时，她正在做蛋糕。She was making a cake when I came into the kitchen.
A cake was being made when I came into the kitchen.
Was a cake being made when I came into the kitchen? Yes, it was./ No, it wasn’t.
7.现在完成时 have/has +been+V(p.p)
他已经结束工作了。He has finished his work. His work has been finished.
Has his work been finished? Yes, it has. / No, it hasn’t.
8.过去完成时 had +been+V(p.p)
到上个月为止，他们已经把这本书翻译成了英语。
They had translated the book into English by the end of last month.
The book had been translated into English by the end of last month.
Had the book been translated into English by the end of last month? Yes, it had./ No, it hadn’t.
9.将来完成时will have +been+V(p.p) 语法学习纲要由江苏省靖江高级中学外语组为英语猫网站编写
The students will have learned 2,000 words by the end of next year.
2,000 words will have been learned by the end of next year.
Will 2,000 words have been learned by the end of next year? Yes, they will./No, they won’t.
10. 过去将来完成时would have +been+V(p.p)
He told me that Mr. Brown would have taught them for two years by the next summer.
I was told that they would have been taught by Mr. Brown for two years by the next summer.
注：1.含有情态动词的谓语变成被动语态时，用“情态动词+be+V(p.p)”构成。如：
You must operate the machine with care. The machine must be operated with care.
Must the machine be operated with care? Yes, it must. / No, it mustn’t.
2.含有“be going to”, “be to”等结构的谓语，变成被动语态时，分别用“be going to +be +V(p.p)”和“be to
+be+V(p.p)”。如：
We are going to discuss the problem at the meeting.
The problem is going to be discussed at the meeting.
Is the problem going to be discussed at the meeting? Yes, it is. / No, it isn’t.
3.被动语态除常用be加过去分词构成外，还可用“get+过去分词”结构。这种结构多用在口语中。如：
The boy got hurt when he was riding to school.
4.被动语态没有完成进行时态，也没有将来进行时态，如果要将这些时态的主动结构变为被动结构，可以用完成时态或一般将来时态来表示。如：
他已被检查过了。He had been being examined.
通常用He has been examined.来代替。 语法学习纲要由江苏省靖江高级中学外语组为英语猫网站编写
当我们到那儿时他将正被检查。He will be being examined when we get there.通常用He will be examined when we get there.注：Get＋过去分词也可以构成被动语态，用这种结构的句子侧重于动作的结果而不是动作本身。如：
the man got hurt on his way home. 那个男人在回家的路上受伤了。
Mary is going to get married. 玛丽准备结婚了。
How did the glass get broken? 杯子怎么破了？著名学者周海中教授在论文《Get-Passive研究》中指出：Get+过去分词是一种新兴的被动语态形式；目前，相对来说它的使用还没有Be+过去分词那么广泛，一般限于口语和非正式书面语；但它却有着用得愈来愈多的趋势，是一种生气蓬勃的语言现象。
(III)被动语态的几种句型
将主动语态转换成被动语态，通常分以下四步进行：
1.将主动语态中的宾语转换成被动语态的主语。
2.将主动语态中的动词改为“be+V(p.p)”
3.原来主动语态中的主语，如果需要，放在by后面以它的宾格形式出现，如没有必要，可以省略。
4.主动语态中的其他句子成分不变。
由于主动语态结构的不同，因而转换成被动语态的方式也各有不同，现分类说明如下：
a.由及物动词形成的被动语态：
(1)S+V+O 主语+动词+宾语语法学习纲要由江苏省靖江高级中学外语组为英语猫网站编写
People grow rice in the south. Rice is grown in the south.
注：带有宾语从句的句子转换成被动语态时，需要将宾语从句变为主语从句，通常用形式主语来代替，而将主语从句后置。
They said that he would come back soon. It was said that he would come back soon.类似的还有：
It is reported / believed /hoped /supposed that ……
(2)S+V+O+C 主语+动词+宾语+宾补
We elected Li Ming monitor of our class. Li Ming was elected monitor of our class.
注：在主动结构中跟不带to的动词不定式作宾补变为被动结构时应加上to作主语补足语。
奴隶们被奴隶主强迫整日整夜工作。Slave-owners made slaves work all day and all night.
Slaves were made to work all day and all night by slave-owners.
(3)S+V+Oi+Od 主语+动词+间宾+直宾 语法学习纲要由江苏省靖江高级中学外语组为英语猫网站编写
昨天他给了我一件漂亮的生日卡。He gave me a beautiful birthday card yesterday. I was given a beautiful birthday card yesterday.
A beautiful birthday card was given to me yesterday.
注：用直接宾语作被动语态的主语时，通常要在间接宾语前加上适当的介词。如：to, for, of等，以加强间接宾语的语气。
b.由动词短语形成的被动语态：
一般情况下，只有及物动词才能跟宾语，而不及物动词不能跟宾语，所以只有及物动词才有被动语态，不及物动词则没有被动语态。但有些不及物动词后面跟上介词或副词后，变成一个动词短语，相当于一个及物动词，就可以形成被动语态。
约翰打开了收音机。John turned on the radio. The radio was turned on.
奶奶照看我姐姐。Grandma takes care of my sister. My sister is taken care of by Grandma.
注：千万不要遗漏介词或副词。
c.祈使句的被动语态通常借助let句式
请把窗户关上。Please close the window. Let the window be closed.
(IV)被动语态的使用时机 语法学习纲要由江苏省靖江高级中学外语组为英语猫网站编写
被动语态的使用往往不是任意的，而是按照表达思想，描述事物的需要，通常在下列情况下使用被动语态。
1.不知道或不必说出动作的执行者。
这本书已被翻译成许多种语言。This book has been translated into many languages.
2.动作的对象是谈话的中心。
我们家乡将建一条新铁路。A new railway will be built in our hometown.
3.修辞的需要，为了使句子更加简练匀称：
他出现在舞台上受到了观众的热烈欢迎。He appeared on the stage and was warmly applauded by the audience. 被动语态便于论述客观事实，故常用于科技文章，新闻报道，书刊介绍及景物描写。
【特别提醒】 有些动词后跟不带to的不定式作宾语补足语，但改为被动结构后要加上“to”。例如
We heard him sing in his room just now.
---He was heard to sing in his room just now.
刚才听到他在房间中唱歌。
一、 被动语态的用法：
1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词
Our classroom is cleaned everyday.
I am asked to study hard by my mother.
Knives are used for cutting things.
2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词
A new shop was built last year.
Dinosaur eggs were laid long long ago.
3. 现在完成时的被动语态构成：has / have + been + 及物动词的过去分词
This book has been translated into many languages.
Many man-made satellites have been sent up into space by many countries.
4. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词
A new hospital will be built in our city.
Many more trees will be planted next year.
5. 含有情态动词的被动语态构成：情态动词+ be + 及物动词的过去分词
Young trees must be watered often.
Your mistakes should be corrected right now.
The door may be locked inside.
Your homework can be handed in tomorrow.
6. 现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词
Uncle Wang is mending my bike now.→
My bike is being repaired by Tom now.
They are planting trees over there. →
Trees are being planted over there by them.
7. 不定式的被动语态：to + be + 及物动词的过去分词
There are two books to be read. →
There are twenty more trees to be planted.
二、 怎样把主动语态改成被动语态?
把主动语态改为被动语态非常简单，可以遵循以下几个步骤：
1. 先找出谓语动词；
2. 再找出谓语动词后的宾语；
3. 把宾语用作被动语态中的主语；
4. 注意人称、时态和数的变化。
例：1. Bruce writes a letter every week. →A letter is written by Bruce every week.
2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning.
3. He has written two novels so far.→Two novels have been written by him so far.
4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.
5. Lucy is writing a letter now.→A letter is being written by Lucy now.
6. You must lock the door when you leave.→the door must be locked when you leave.
三、 使用被动语态应注意的几个问题：
1. 不及物动词无被动语态。
What will happen in 100 years.
The dinosaurs disappeared about 65 million years ago.
2. 有些动词用主动形式表示被动意义。
This pen writes well.
This new book sells well.
3. 感官动词或使役动词使用省略to的动词不定式，主动语态中不带to ，但变为被动语态时，须加上to 。
例：make somebody do something→somebody+ be +made to do something
see somebody do something→somebody +be +seen to do something
A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.
The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
4. 如果是接双宾语的动词改为被动语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词是由与其搭配的动词决定。
He gave me a book.→A book was given to me by him.
He showed me a ticket.→A ticket was shown to me by him.
My father bought me a new bike. →A new bike was bought for me by my father.
5. 一些动词短语用于被动语态时，动词短语应当看作一个整体，而不能丢掉其中的介词或副词。
We can’t laugh him. →He can’t be laugh by us.
He listens to the radio every day. →The radio is listened to by him every day.
The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse.
....can be used .... be在句中是：助动词，“can + be + p.p.过去分词”构成“情态动词的被动语态”。助动词：帮助动词构成一种时态、语态、语气（否定或肯定）。be: 可用于：情态动词的被动语态中，can/may/must ... + be + v.ed ...; This must be done by the dark. 天黑前必须做完这事。 将来时的被动语态中，shall/ will + be + v.ed.....; We shall be given a speech on writing paper tomorrow afternoon. 明天下午针对写论文有人要给我们一个讲座。
这里是含有情态动词can的被动语态。be起的是帮助构成被动语态的作用。只要是含有情态动词的被动语态、含有be的祈使句和动词不定式，都可以用be的原形形式。
情态动词后加be动词原形
章鸣阿壳： 表达不正确,正确的表达是:Can I pay by credit card?或者 is that all right to pay by credit card?一、词语举例:1、credit card limit 信用卡限额2、spend more money than my credit card limit 花钱超过信用卡限额 二、例句示范:1、Many young ...
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普兰县19635654194： creditcard是什么意思 - ？
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普兰县19635654194： Credit Card是什么意思? - ？
章鸣阿壳： 英文:credit card or debit card 中文:信用卡或借记卡 很高兴为您解答 祝你生活愉快,学习进步 如果你对这个答案有什么疑问,请追问 如果满意记得采纳哦·~~
普兰县19635654194： visa card 和 credit card 有什么区别? - ？
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