情态动词讲解及练习

注：表示请求、建议或征求对方意见时，用Would you…?比用Will you…?更婉转。如：
Will/Would you please keep the door open?请让门开着好吗?
Will/Would you go with me?你愿意和我一起去吗?
(2)表示真理或习惯：惯于，总是。如：
He oughtn't to / shouldn't have done that.他本来就不该做那件事.（可是做了）
6.“would＋have＋过去分词”表示对过去的某种情况进行猜测,或本来要做某事却因某种原因未做成,通常用来说明某一情况,但不像用should或ought to那样含有责备之意.如：
I guess the poet would have been about twenty when she wrote her first poem.
Another worker wouldn't have acted like that.
8．I often felt troubled in my teens and my grandma ________ comfort me, saying “Life is like that, dear”.
(3)表示要求：一定，必须。如：
You will report to me afterward.你稍后一定要向我报告。
(4)表示猜测：可能，大概。如：
This will be the house you’re looking for.这大概就是你找的那所房子了。
(5)表示功能：能。如：
This auditorium will/would seat one thousand people.这个礼堂能容纳一千人
A．shouldn'tB．mustn't
C．couldn' tD．wouldn't
【答案】C
【解析】
【详解】
考查情态动词。A. shouldn't不应该；B. mustn't禁止，不允许；C. couldn' t不可能；D. wouldn't不会。句意：---他对结果很满意，是吗? ---不。考试太难了，他不可能通过。固定结构：couldn' t have done“不可能做某事”，此处是对过去事情有把握的否定推测。故选C。
【点睛】
will/would是情态动词，其表达的意思如下。
(1)表示意志或意愿：决心，愿意，……好吗?
We will do our best to save the child.我们会尽力抢救这个孩子。
I told her to stop crying, but she just wouldn’t listen.我叫她别哭，可她就是不愿听。
C．could have avoidedD．could have been avoided
【答案】D
【解析】
【详解】
考查“情态动词+完成式”。句意：如果愤怒的女乘客和巴士司机保持冷静，这起导致15人死亡的事故本来是可以避免的。could have done“本来能做而没有做”，且句子主语The accident和谓语动词avoid之间是被动关系，结合句意可知答案为D。
A．should theyB．they should
C．dare theyD．they dare
【答案】A
【解析】
【详解】
A．wouldB．mightC．shouldD．must
【答案】A
【解析】
【详解】
考查情态动词。句意：在我十几岁的时候，我经常感到烦恼，我的奶奶会安慰我说，“生活就是这样，亲爱的”。此处是would+动词原形，表示“过去总是做某事”。故选A。
9．The professor warned the students that on no account ________ use mobile phones in his class.
情态动词讲解及练习
一、单项选择情态动词
1．My computer ________ start this morning. There must have been something wrong with it.
A．wouldn’tB．shouldn’tC．couldn’tD．mustn’t
【答案】A
【点睛】
情态动词+ have done结构：
1.“must + have +过去分词”表示对过去发生的事情或状态进行推测，语气比较坚定，通常只用于肯定句。如：It must have rained last night,for the ground is wet.
2.“can / could + have +过去分词”表示对过去某种情况的怀疑或不确定。can和could一般用于否定句和疑问句，could的语气较can弱。如：He can't have finished the work so soon.
5.“should / ought to + have +过去分词”表示过去本该做某事但没做，其否定式表示过去不该做某事但做了，这种句式含有不满或责备之意，ought to的语气比should强一些。如：
You ought to / should have studied harder.你本应该更努力学习的.（但没有）
3.“may / might + have +过去分词”表示对已发生的动作或存在的状态进行不肯定的推测，might的语气比may弱一点。这种结构主要用于肯定句和否定句，疑问句改用can或could。如：They may not have known it beforehand.
4.“need + have +过去分词”表示过去做了不必做或不需要做的事情，或过去做某事纯属多余。如：I needn't have bought so much wine—only five people came.
—Don’t count on it too much. It ________ break down and you’d better make a copy of them.
A．mustB．can
C．shouldD．will
【答案】B
【解析】
【详解】
考查情态动词。句意：——有一台计算机来储存照片真是太棒了。——不要过度依赖它。它有时候也会出故障，你最好做一个备份。计算机出故障这是可能的事情，表示客观可能性用can。must肯Байду номын сангаас，必须；should应该；will表意愿。故B选项正确。
【点睛】
情态动词+ have done结构：
1.“must + have +过去分词”表示对过去发生的事情或状态进行推测,语气比较坚定,通常只用于肯定句.如：It must have rained last night,for the ground is wet.
2.“can / could + have +过去分词”表示对过去某种情况的怀疑或不确定.can和could一般用于否定句和疑问句,could的语气较can弱.如：He can't have finished the work so soon.
【解析】
【详解】
考查情态动词。A. wouldn’t不会；B. shouldn’t不应该；C. couldn’t不能；D. mustn’t禁止，不允许。句意：我的电脑今早启动不了。一定是出了什么问题。此处would表示过去的习惯或反复性的动作。故选A。
2．Paul did a great job in the speech contest. Hemany times last week.
5.“should / ought to + have +过去分词”表示过去本该做某事但没做,其否定式表示过去不该做某事但做了,这种句式含有不满或责备之意,ought to的语气比should强一些.如：
You ought to / should have studied harder.你本应该更努力学习的.（但没有）
I guess the poet would have been about twenty when she wrote her first poem.
Another worker wouldn't have acted like that.
4．It has been announced that all the candidates ___________ remain in their seats until all the papers have been collected.
He oughtn't to / shouldn't have done that.他本来就不该做那件事.（可是做了）
6.“would＋have＋过去分词”表示对过去的某种情况进行猜测，或本来要做某事却因某种原因未做成，通常用来说明某一情况，但不像用should或ought to那样含有责备之意。如：
Oil will float on water.油总是浮在水面上。
She will listen to music alone in her room for hours.她独自在房间里听音乐，一听往往就是几小时。
He would get up early when he lived in the country.他住在乡下时总是早起。
A．need have practisedB．might practise
C．must have practisedD．could practise
【答案】C
【解析】
【详解】
考查情态动词。句意：保罗在演讲比赛中表现得很好。他上星期一定练习了很多次。must have done是对过去发生的动作最有把握的猜测，意思是“一定”。故C选项正确。
6．— Mum, little Ray broke his toys again!
—It doesn't matter. You see, accidents _____happen.
A．shallB．shouldC．mustD．will
【答案】D
【解析】
【详解】
考查情态动词辨析。句意：——妈妈，小雷又弄坏了他的玩具。——没事的，你看，意外总会发生。A. shall将要，会；B. should应当；C. must必须；D. will总是。Will可以表示习惯，意思为“惯于，总是”。故D选项正确。
A．shallB．could
C．wouldD．ought
【答案】A
【解析】
【详解】
考查情态动词用法。句意：据宣布，所有的候选人都要坐在位置上，直到所有的试卷都被收齐。根据句意可知本句是考试规则，情态动词shall可以表示“按照规则/规定/法律要做的事情”，符合本句语境。故A项正确。
5．—It’s really great to have a computer to store my photos.
3．The accident which left 15 people on board dead ________ if both the angry female passenger and the bus driver had kept calm.
A．should have avoidedB．should be avoided
3.“may / might + have +过去分词”表示对已发生的动作或存在的状态进行不肯定的推测,might的语气比may弱一点.这种结构主要用于肯定句和否定句,疑问句改用can或could.如：They may not have known it beforehand.
4.“need + have +过去分词”表示过去做了不必做或不需要做的事情,或过去做某事纯属多余.如：I needn't have bought so much wine—only five people came.
分析句子可知，本句中的will表示习惯，意思为“惯于，总是”且符合语境。故D选项正确。
7．---He was satisfied with the result, wasn't he?
---No. It was so difficult that he __________have passed it.