should
- aux.本应，本当;可以，会;必须;可能;想;假如，万一;将;真该，真应当;竟然会
shouldmodal verb
（常用于纠正别人）应该，应当
used to show what is right, appropriate, etc., especially when criticizing sb's actions
You shouldn't drink and drive.
你不该酒后驾车。
He should have been more careful.
他应当更小心点儿才是。
A present for me? You shouldn't have ! (= used to thank sb politely)
给我的礼物？您太客气了！
（提出或征询建议）该，可以
used for giving or asking for advice
You should stop worrying about it.
你该不要再为此事担忧了。
Should I call him and apologize?
我是不是应该打电话向他道歉？
I should wait a little longer, if I were you .
假如我是你的话，我会再等一会儿。
‘She doesn't think she'll get a job.’ ‘She should worry, with all her qualifications (= she does not need to worry) .’
“她担心找不到工作。”“她那么好的条件，还担心什么呀。”
（表示预期）应该会，可能
used to say that you expect sth is true or will happen
We should arrive before dark.
我们天黑以前应该能赶到。
I should have finished the book by Friday.
到星期五我应该能读完那本书。
The roads should be less crowded today.
今天路上该不那么拥挤了吧。
（表示与预期相反）本应，本当
used to say that sth that was expected has not happened
It should be snowing now, according to the weather forecast.
按天气预报，现在该下雪才是。
The bus should have arrived ten minutes ago.
公共汽车十分钟以前就该到了。
（与I或we连用代替would，表示虚拟结果）就将
used after I or we instead of would for describing what you would do if sth else happened first
If I were asked to work on Sundays, I should resign.
要是叫我星期天加班，我就辞职不干了。
（表示可能）假如，万一
used to refer to a possible event or situation
If you should change your mind, do let me know.
假如你改变主意的话，一定要告诉我。
In case you should need any help, here's my number.
万一你需要帮助的话，这是我的电话号码。
Should anyone call (= if anyone calls) , please tell them I'm busy.
如果有人打电话来，请告诉他我正忙着。
（在间接引语中用作shall的过去时）
used as the past form of shall when reporting what sb has said
He asked me what time he should come. (= His words were: ‘What time shall I come?’)
他问我他应该什么时候来。
I said (that) I should be glad to help.
我说我乐意帮忙。
（用于that引导的、表示建议或安排的从句中）
used after that when sth is suggested or arranged
She recommended that I should take some time off.
她建议我应该休息一段时间。
In order that training should be effective it must be planned systematically.
为使培训有成效，必须有系统的计划。
In order that training be effective…
（用于许多表示感情的形容词后的that从句中）
used after that after many adjectives that describe feelings
I'm anxious that we should allow plenty of time.
我殷切希望我们能留出充裕的时间。
I find it astonishing that he should be so rude to you.
他竟然对你这样无礼，真叫我吃惊。
（与I和we连用，表示客气地请求）
used with I and we in polite requests
I should like to call my lawyer.
我希望给我的律师打个电话。
We should be grateful for your help.
对您的帮助我会非常感激。
（与I和we连用，表示没有把握）
used with I and we to give opinions that you are not certain about
I should imagine it will take about three hours.
我想得用差不多三个小时吧。
‘Is this enough food for everyone?’ ‘ I should think so .’
“这些食物够所有人吃吗？”“我觉得够了吧。”
‘Will it matter?’ ‘ I shouldn't think so .’
“这有关系吗？”“不会吧。”
（表示十分赞同）
used for expressing strong agreement
‘I know it's expensive but it will last for years.’ ‘ I should hope so too! ’
“我知道价钱贵，但能用好多年。”“我也是这么想的！”
‘Nobody will oppose it.’ ‘ I should think not! ’
“谁也不会反对的。”“我想也是！”
（表示拒绝、恼怒或惊奇）
used to refuse sth or to show that you are annoyed at a request; used to express surprise about an event or a situation
Why should I help him? He's never done anything for me.
我干吗要帮他呢？他从来没为我做过什么。
How should I know where you've left your bag?
我怎么知道你把包丢在哪儿了？
I got on the bus and who should be sitting in front of me but Tony!
我上了公共汽车，没想到坐在我前面的竟然是托尼！
（表示假如对方看见或经历某事物，一定会感兴趣或吃惊）真该，真应当
used to tell sb that sth would amuse or surprise them if they saw or experienced it
You should have seen her face when she found out!
你真该看看她发现事情真相时脸上的表情！
should
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2
MODAL 应该;应当
You use should when you are saying what would be the right thing to do or the right state for something to be in.I should exercise more...
我应该多锻炼一些。
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3
MODAL (表示给出指示或公布官方命令)应该，必须
You use should to give someone an order to do something, or to report an official order.All visitors should register with the British Embassy...
所有游客都必须到英国大使馆登记。
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4
MODAL (表示与说话者的意愿相反)本应
If you say that something should have happened, you mean that it did not happen, but that you wish it had. If you say that something should not have happened, you mean that it did happen, but that you wish it had not.I should have gone this morning but I was feeling a bit ill...
今天早晨我本应该走的，但是我觉得有点不舒服。
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5
MODAL (表示预期或可能性)应该会，可能
You use should when you are saying that something is probably the case or will probably happen in the way you are describing. If you say that something should have happened by a particular time, you mean that it will probably have happened by that time.You should have no problem with reading this language...
阅读这种语言你应该没问题。
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6
MODAL (用于疑问句中表示征求意见、同意或咨询情况)可以，应该
You use should in questions when you are asking someone for advice, permission, or information.Should I or shouldn't I go to university?...
我该不该去上大学呢？
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7
MODAL (通过假设自己处于对方立场会怎么做来提出建议)应该，可以，会
You say 'I should', usually with the expression 'if I were you', when you are giving someone advice by telling them what you would do if you were in their position.I should look out if I were you!
如果我是你，我会小心的。
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8
MODAL (用在条件从句中表示事件发生的可能性)将要，假定要
You use should in conditional clauses when you are talking about things that might happen.If you should be fired, your health and pension benefits will not be automatically cut off...
如果你被解雇，你的医疗和养老保险金不会自动中断。
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9
MODAL (用在由 that引导的从句中，放在某些动词、名词和形容词之后，表示将来的事件或情况)应该，能够，竟然会
You use should in 'that' clauses after certain verbs, nouns, and adjectives when you are talking about a future event or situation.He raised his glass and indicated that I should do the same...
他举起了杯子并且示意我也应该这样做。
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10
MODAL (与第一人称连用，表示没有把握)会，可能
You use should in expressions such as I should think and I should imagine to indicate that you think something is true but you are not sure.I should think it's going to rain soon...
我想可能马上要下雨了。
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11
MODAL (与第一人称连用表示客气的请求等)想要，将会
You use should in expressions such as I should like and I should be happy to show politeness when you are saying what you want to do, or when you are requesting, offering, or accepting something.I should be happy if you would bring them this evening...
如果今晚你将他们带来的话，我会很高兴。
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12
MODAL (强调所经历的事有趣、令人震惊等)实在该，真该，真应当
You use should in expressions such as You should have seen us and You should have heard him to emphasize how funny, shocking, or impressive something that you experienced was.You should have heard him last night!
昨晚你真该听听他所说的。
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13
MODAL (用在由who，what等引导的疑问结构中，后接but，强调某件事令人惊讶或震惊)居然
You use should in question structures which begin with words like 'who' and 'what' and are followed by 'but' to emphasize how surprising or shocking a particular event was.I'm making these plans and who should I meet but this blonde guy and John.
我正在制订这些计划，没想到这时候居然遇上这个金发的家伙和约翰。
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It 's very important to me that you should be there .
你应该到场，这对我很重要。
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By that time the new system should be up and running .
到那时这个新系统应该会运转起来了。
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She of all people should know the answer to that .
在所有的人中，唯有她最应知道那个问题的答案。
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Many people feel that the law should be changed .
许多人都觉得这项法律应该修改。
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I think we should go back to first principles .
我认为我们应该回到基本原则上。
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You should not go out in the heat of the day .
你不应该在天最热的时候外出。
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The new trade agreement should facilitate more rapid economic growth .
新贸易协定应当会加快经济发展。
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Students should aim to become more independent of their teachers .
学生应该努力逐渐减少对老师的依赖。
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In case you should need any help , here 's my number .
万一你需要帮助的话，这是我的电话号码。
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I told you we should have done it my way !
我跟你说过我们原本应该用我的方法来做这事。
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Students should take full advantage of the university 's facilities .
学生应该充分利用大学的设施。
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If you should change your mind , do let me know .
假如你改变主意的话，一定要告诉我。
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She recommended that I should take some time off .
她建议我应该休息一段时间。
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You should have seen her face when she found out !
你真该看看她发现事情真相时脸上的表情！
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I should never have taken that job in the first place .
我当初就不该接受那份工作。
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Why should I want to make you feel bad ?
我干吗要让你难过呢？
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The new building should be ready by 2007 .
这座新大楼该能于2007年竣工。
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£ 50 should be enough to be going on with .
50英镑该够应付一时半会儿的了。
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The drug should only be used under medical supervision .
这种药须遵医嘱方可使用。
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It was decided the school should purchase new software .
已经决定学校要购买新软件。
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Look , I think we should go now .
喂，我想我们现在得走了。
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We need to discuss when we should go .
我们需要商量一下什么时候动身。
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It is important that he should attend every day .
他每天都要出席，这很重要。
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You should look out for yourself from now on .
从现在起你应该多为自己着想。
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The situation required that he should be present .
这种情形需要他在场。
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You should put more effort into your work .
你应该更加努力地工作。
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Many people think that party politics should not enter into local government .
许多人都认为，地方政府内不应拉帮结派。
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A good education should not be the monopoly of the rich .
良好的教育不应该成为富人的专利。
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He should be able to lead a perfectly normal life .
他应该能够过上完全正常的生活。
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In theory , these machines should last for ten years or more .
从理论上讲，这些机器应能用十年以上。
无时态和人称变化，后接动词不定式，表示义务、责任、建议等，侧重反映客观情况。
I ought to go home now. I must prepare dinner for my children.
我得回家了，我必须给孩子们做饭。
Such things ought not to be allowed.
这种事情不该允许。
You ought to finish it on time.
你应该按时完成它。
侧重自己的主观看法。在表示义务、责任时，语气比 ought 稍弱；在表示建议而非义务时，比 ought 更常用。
You should have a mind of your own.
你应该有自己的主见。
He should go and see his father.
他应该去看看父亲。
试比较：
I ought to go.
我得走了。（侧重客观原因）
I should go.
我应该走了。（侧重主观意愿）
We ought to help her.
我们应该帮助她。（指在道义上有责任这样做）
We should help her.
我们该帮她。（帮助她是明智之举，但并非指在道义上必须这样做）