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1、知识点 should的用法大全should的用法大全【知识点解析知识点解析】一、should 作为助动词 shall 的过去式，可以在间接引语中与第一人称主语搭配，表示过去将来时间。The group leader announced that we should(=would)begin to work soon.小组长宣布：我们不久就开始工作。A week ago,I told him that I should(=would)go to Beijing the next day.一个星期以前，我告诉他我第二天就去北京。二、should 作为情态动词，通常用来表示现在或将来的责任或义务，译
2、作“应该”、“应当”，这时它可以和ought to，be supposed to 互换使用。should的用法大全【知识点解析知识点解析】三、should 作为情态动词，可以用在条件状语从句中，表示语气较强的假设，译作“万一”、“竟然”，这时也可将 should 置于从句之首，即将 should 放在主语前面，而省略从属连词 if。例如：If you should fail to come,ask Mrs.Chen to work in your place.=Should you fail to come,ask Mrs.Chen to work in your place.万一你来不了，就
3、叫陈夫人代替你。should的用法大全【知识点解析知识点解析】If anyone should come,say I am not at home.=Should anyone come,say I am not at home.万一有人来访，就说我不在家。If it should rain tomorrow,I wouldnt go.=Should it rain tomorrow,I wouldnt go.万一明天下雨，我就不去了。should的用法大全【知识点解析知识点解析】四、should 作为情态动词，可以表示谦逊、客气、委婉之意，译为“可”、“倒”。例如：I should say
4、that it would be better to try it again.我倒是认为最好再试一试。You are mistaken,I should say.据我看，你搞错了。He should expect their basketball team to win the match.他倒是希望他们的篮球队赢得这场比赛的胜利。Should you like some tea?你可喜欢喝茶？should的用法大全【知识点解析知识点解析】五、should 作为情态动词，可以用来表示意外、惊喜或者在说话人看来是不可思议的。尤其在以 why,who,how 等开头的修辞疑问句或某些感叹句中常常
5、译为“竟会”、“居然”例如：How should I know it?我怎么会知道这件事？Why should you be so late today?你今天怎么来得这么晚？When I went out,whom should I meet but my old friend Xiao Li!当我出去时，想不到竟会碰见我的老朋友小李！I dont see any reason why he shouldnt be happy.我不明白为什么他居然不愉快。should的用法大全【知识点解析知识点解析】六、should 作为情态动词，可以用来表示有较大可能实现的猜测、推论，通常译为“可能”、“
6、总该吧”，相当于 be expected to 例如：They should be home by now,I think.我想现在他们总该到家了吧。The report was written after a careful investigation,so it should be reliable.这份报告是经过周密调查后才写成的，所以应该是可靠的。should的用法大全【知识点解析知识点解析】七、should 作为情态动词，用在由 so that,for fear that,lest 引导的目的状语从句和 in case(that)引导的条件状语从句中，有“能够”、“可能”、“会”之意
7、。例如：They got up early so that they should(=could/might)catch the first bus in time.他们起得很早以便能及时赶上头班公交车。should的用法大全【知识点解析知识点解析】He is working hard for fear that he should fall behind others.他努力工作，唯恐落在别人后面。We went over the document again and again lest we should miss any of the main points.我们把文件看了一遍又一遍，
8、唯恐忽略了其中的什么要点。He took an umbrella in case(that)it should rain.他带了一把雨伞，以防天下雨。should的用法大全【知识点解析知识点解析】八、should 作为情态动词，可以用于下列虚拟语气句中：1.用在表示与将来事实相反的条件状语从句中，构成“If should(do sth),would/could/might(do sth.)”句式。例如：If it should(或 were to)rain tomorrow,the sports meeting would be put off.=Should it rain tomorrow
9、/Were it to rain tomorrow,the sports meeting would be put off.如果明天下雨，运动会就会延期举行。should的用法大全【知识点解析知识点解析】2.用在 suggest(propose),arrange,plan,decide,advise,order,demand,request,desire,insist 等表示“建议”、“要求”、“命令”、“决定”、“安排”、“计划”、“主张”的动词后面接的宾语从句中。这里的 should 也可以省略。3.用在“It is desired/suggested/requested/ordered/
10、proposed/decided”之后由 that 引导的主语从句中，should 也可以省略。例如：4.用在 suggestion,motion,proposal,order,plan,idea,advice,request,decision,require 等名词后面接的表语从句或同位语从句中，should 也可以省略。should的用法大全【知识点解析知识点解析】5.用在“It is/was necessary/important/strange/incredible”或“It is a pity/a shame/no wonder”之后由 that 引导的主语从句中，should 有“
11、应该”、“必须”、“竟然”、“居然”之意。例如：It is necessary that he(should)be sent there at once.有必要马上派他到那里去。It is strange that the wheel should turn so slowly.真奇怪，这个轮子竟然转动得如此之慢。It is a great pity/shame/that he should be so conceited.真遗憾，他竟会这样自高自大。should的用法大全【知识点解析知识点解析】九、“should have+-ed 分词”结构用来表达下述意义：1.表示“应该已经”，“本来应该
12、”，即过去该做某事但实际没有做，其否定式“shouldnt have+-ed 分词”意为“本来不应该”。例如：These cells should have been kept in some dry places.这些电池本来应该放（保存）在干燥的地方。（但实际上没有把它们放在干燥的地方。）You shouldnt have put those cells in the damp place.你本来不该把那些电池放在潮湿的地方。（但实际上已经把它们放到潮湿的地方了。）should的用法大全【知识点解析知识点解析】2.表示“（估计）应该已经”，“大概已经”，即对过去情况的推测。例如：They
13、left at nine,so they should have arrived.=probably have arrived)home by now.他们是九点钟走的，现在应该已经到家了。They should have finished their work,for they began to do it so early.他们很早就开始工作，现在大概已经干完了。should的用法大全【知识点解析知识点解析】3.意为“竟然已经”，“居然已经”，即表示说话人对已经出现的事态感到“惊奇、惊喜、怀疑”。Im surprised that he should have been so foolis
14、h.我很奇怪，他竟然会这么傻。Im amazed that Mr.Harris should have said nothing about the matter.这件事，哈里斯先生竟然只字未提，对此我大为惊异。It is wonderful that you should have achieved so much these years.这几年你竟然取得如此大的成就，你真了不起。should的用法大全【知识点解析知识点解析】此外，should 还可以出现在“should be doing sth”或“should have been doing sth”等句式中，表示“应该正在”或表示说话
15、人的某种不满情绪。例如：Why should we be sitting here doing nothing?我们干嘛坐在这里闲着？You should be wearing a mask.你应当戴着口罩。She shouldnt be working like that.She is still so weak.她不应当那样干。她身体还很虚弱。You should have been waiting for us.Why havent you?你应当等着我们的。怎么没有等？should的用法大全【典型例题典型例题】1.You _ those letters.Why didnt you?A.
16、should post B.should have posted C.must have posted D.ought to post.答案：B解析：“should have+-ed 分词”结构表示“应该已经”，“本来应该”，即过去该做某事但实际没有做。should的用法大全【典型例题典型例题】2.Jean _have kept his promise.I wonder why he changed his idea.A.must B.should C.need D.would 答案：B解析：“should have+过去分词”表示“过去本来应该(但没能)做某事”；keep ones promise 意为“信守诺言”。should的用法大全【典型例题典型例题】3.He asked me for this book many times.Please tell him that he _ have it tomorrow.A.must B.may C.shall D.both B and C答案：D解析：may和shall均可表“允诺”