情态动词表推测 (2)优秀课件
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《情态动词表示推测》PPT课件
会说出这种话的
• The weather in Tibet
could be cold now. 精选PPT
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may
• may + 动词原形
• may have done (对过去
• may not +动词原形
• (对现在情况的推测), 其肯定式表示“可能”; 否定式表示“可能不”.
• He may be right; I may not be right.
came to see us.
school today.
• --It can’t be Terry. He’s now in London.
can’t have done (对过
•can’t + 动词原形(对现 在情况的推测),表示不
去情况的推测),推测 某事不可能已经发生。
可能.
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could
情态动词表示推测用法的比较
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must 只用在肯定陈述句中
• must+状态动原(对现 在情况的推测),表示 满有把握,“一定、想 必已”
• The man could eat all those apples, so he must have a good digestion.
• She must dislike such a man.
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(may表推测不用于疑问句:)
• 那会是真的吗
情况的推测),对已经 发生的事进行推测,意为 “可能已......”;否定式表 示 “可能还不.......”
• She isn’t here by now; she may have missed her train.
• The weather in Tibet
could be cold now. 精选PPT
4
may
• may + 动词原形
• may have done (对过去
• may not +动词原形
• (对现在情况的推测), 其肯定式表示“可能”; 否定式表示“可能不”.
• He may be right; I may not be right.
came to see us.
school today.
• --It can’t be Terry. He’s now in London.
can’t have done (对过
•can’t + 动词原形(对现 在情况的推测),表示不
去情况的推测),推测 某事不可能已经发生。
可能.
精选PPT
3
could
情态动词表示推测用法的比较
精选PPT
1
must 只用在肯定陈述句中
• must+状态动原(对现 在情况的推测),表示 满有把握,“一定、想 必已”
• The man could eat all those apples, so he must have a good digestion.
• She must dislike such a man.
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11
(may表推测不用于疑问句:)
• 那会是真的吗
情况的推测),对已经 发生的事进行推测,意为 “可能已......”;否定式表 示 “可能还不.......”
• She isn’t here by now; she may have missed her train.
情态动词表示推测ppt课件
费,遗憾,不好后果)
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情态动词表示推测的用法
1.对现在(事情)推测: must + v. (肯定)
may/might/could/can+v. (可能)
(情态动词+ 动词原形) can’t + v. (不可能)
2.对过去(事情)推测:(情态动词+ 完成式)
must have done (表肯定性推测) “肯定,准是,” can’t /couldn’t have done (表否定性推测)“不可能”
It must have rained last night,for the
road is wet.(It can’t/couldn’t have rained
last night.)
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1.It must have rained last night.for the ditch(水道,渠道) is full of water.
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must表推测的反意疑问句:
反意问句部分永远不带must.
1.She must be a teacher,isn’t she?
2.She must have gone to Shanghai,
hasn’t she?
3.She must have gone to Shanghai
yesterday, didn’t she?
情态动词表示推测的用法
1.对现在(事情)推测 2.对过去(事情)推测
must +v. (肯定) might/could/may/can +v. (可能) can’t+v. (不可能)
1.must have done (表肯定性推测) “肯定,准是,”
情态动词表推测课件.ppt
He can`t be at home. = It is impossible that he is at home. 他一定不在家。 (2)can /can`t+ have done,表示对过去发生的动作进 行推测。
He can`t have gone to Shanghai for I saw him a
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二、 “ought to+have+done”
• 表示过去应该做而实际并没有做,译成 “理应做……”,往往表示遗憾。与 “should+have+done”用法基本一样。
I ought to have gone home last Sunday. 我理 应上星期日回家。
• You ought not to have given him more help. 你不应该帮助他那么多。
注:must表示推测时很少用于将来的情况。一般不用
He must come tomorrow.可用It`s certain / I`m
sure that he will come tomorrow.
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2. can / could的用法 (1)can表示推测“可能性”时,往往用于否定句或疑 问句。Can`t“一定不”,can在疑问句中意思是“会、可 能”。
minute ago. 他不可能去了上海,我刚才还看见他。 It`s so late. Where can she have gone? 天晚了,她可 能去哪儿了呢?
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3. may和might的用法 (1) may, might表示推测“可能性”时,意思 是“可能”、“也许”
He may / might be American. = It is possible
He can`t have gone to Shanghai for I saw him a
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二、 “ought to+have+done”
• 表示过去应该做而实际并没有做,译成 “理应做……”,往往表示遗憾。与 “should+have+done”用法基本一样。
I ought to have gone home last Sunday. 我理 应上星期日回家。
• You ought not to have given him more help. 你不应该帮助他那么多。
注:must表示推测时很少用于将来的情况。一般不用
He must come tomorrow.可用It`s certain / I`m
sure that he will come tomorrow.
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2. can / could的用法 (1)can表示推测“可能性”时,往往用于否定句或疑 问句。Can`t“一定不”,can在疑问句中意思是“会、可 能”。
minute ago. 他不可能去了上海,我刚才还看见他。 It`s so late. Where can she have gone? 天晚了,她可 能去哪儿了呢?
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3. may和might的用法 (1) may, might表示推测“可能性”时,意思 是“可能”、“也许”
He may / might be American. = It is possible
关于情态动词表示推测和可能性课件
二、情态动词表推测时的时态问题
❖
以must为例
❖ 1、推测现在的事,结构是:must do/be
❖ eg. He goes to school with a big bag everyday. He must be a student.
❖ 2、推测正在进行的事:must be doing
❖ eg.The light is off now. He must be sleeping.
Food poisoning can cause death. ___食__物_中__毒__可__导__致_死__亡__。____________________
1. It is usually warm in my hometown in March, but it _____ be rather cold sometime.
3. 疑问句中的推测,往往用can或could。
❖Mr. Bush is on time for everything.
How ______ it be that he was late for the opening ceremony?
A. can
B. should
C. may
D. must
翻译:布什先生做什么事都很准时,他怎么 会开幕式迟到呢?
should表推测时,“按 道理该如此”,一般句末 有时间状语,或有语境暗 示。
Shanghai before it
gets dark. A. shall B. should C. must D. need
①It's 8 o'clock now. He
should be in the office now.
情态动词表示推测和可能性课件
一 情态动词表推测; 二 情态动词+have done;
三 解题技巧
Let's read and translate the sentences!
①She couldn't/can't be so stupid to do that. 她不可能去做那种事吧。
②I may be busy from tomorrow on. 从明天起我可能会忙起来。 ③You must be tired after working so long. 你工作这么久以后肯定累了吧。 ④She shouldn't be out in such an early 她不会这么一大早就出去。 morning.
①It's 8 o'clock now. He
should be in the office now. ②Hi, Mum! I'm on the bus. I should be home in about ten minutes.
注:can 有时也用于肯定句中表示推测, 主要用于表示理论上的可能性(即从理论上看是可 能的,但实际未必会发生),或表示“有时”之意。 如:
二、“情态动词+完成式”
must have done can't have done may/might have done can have done
表对过去的猜测
should(ought to) have done shouldn't(oughtn't to havedone could have done need have done needn't have done
一、情态动词表推测
1. 肯定的推测
三 解题技巧
Let's read and translate the sentences!
①She couldn't/can't be so stupid to do that. 她不可能去做那种事吧。
②I may be busy from tomorrow on. 从明天起我可能会忙起来。 ③You must be tired after working so long. 你工作这么久以后肯定累了吧。 ④She shouldn't be out in such an early 她不会这么一大早就出去。 morning.
①It's 8 o'clock now. He
should be in the office now. ②Hi, Mum! I'm on the bus. I should be home in about ten minutes.
注:can 有时也用于肯定句中表示推测, 主要用于表示理论上的可能性(即从理论上看是可 能的,但实际未必会发生),或表示“有时”之意。 如:
二、“情态动词+完成式”
must have done can't have done may/might have done can have done
表对过去的猜测
should(ought to) have done shouldn't(oughtn't to havedone could have done need have done needn't have done
一、情态动词表推测
1. 肯定的推测
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(2)must表推测只能用于肯定句。 如表示“一定不、肯定不”的意思时,应用
can`t, 如询问某种可能时,应用can。 He must know my address. 他肯定知道我的地 址。 (一定) He can`t know my address. 他肯定不知道我的 地址。 (一定不) Can he know my address? 他知道我的地址吗? (询问可能性)
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情态动词 can, could, may,might,must 表推测的用法:
1. must的用法 (1)表示推测“可能性”时,意思是“一定、 准是”,语气较肯定,较有把握。
He must be American. = It is certain that he is American. 他准是个美国人。
minute ago. 他不可能去了上海,我刚才还看见他。 It`s so late. Where can she have gone? 天晚了,她可 能去哪儿了呢?
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3. may和might的用法 (1) may, might表示推测“可能性”时,意思 是“可能”、“也许”
He may / might be American. = It is possible
that he is American. 他可能是个美国人。 注:might不表示过去时态,只是语气上比may更 委婉,表示的可能性更小。 (2)may, might表推测时,可以用于否定句,意
思是“可能不、也许不”,但不用于疑问句。
He may / might not be at home. 他也许不在家。
对现在或未来的推测
表示对当前行为、状态、情况的推测用: must, may,might,would, should, ought to
+ do/be
The light is on, so he must be at home now. 灯亮着, 他现在肯定在家。
She may be at home. 她可能在家呢.
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表示对过去行为的怀疑,用于疑问句,译成“可 能做过……吗?”。
1. There is no light in the room. Can they have gone out? 屋里没有灯,他们可能出去了 吗?
He can`t be at home. = It is impossible that he is at home. 他一定不在家。 (2)can /can`t+ have done,表示对过去发生的动作进 行推测。
He can`t have gone to Shanghai for I saw him a
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情态动词 will, would表推测的用法:
1.will\would的用法 (1)表示推测“可能性”时,意思是“很有 可能,大概”,表示估计和猜想.
These things will happen.
It would be about ten o’clock when she left home.
注:must表示推测时很少用于将来的情况。一般不用
He must come tomorrow.可用It`s certain / I`m
sure that he will come tomorrow.
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2. can / could的用法 (1)can表示推测“可能性”时,往往用于否定句或疑 问句。Can`t“一定不”,can在疑问句中意思是“会、可 能”。
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对此时此刻正在进行的动作的推测
must / may / might / could + be doing The light is on. He must/may/might/could be studying. The light isn’t on. He can not/may not/might not/could not be studying. Can he be studying now?
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二、 “ought to+have+done”
表示过去应该做而实际并没有做,译成“理应 做……”,往往表示遗憾。与“should+have+done” 用法基本一样。
I ought to have gone home last Sunday. 我理 应上星期日回家。
You ought not to have given him more help. 你不应该帮助他那么多。
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(3)must表示推测时,可以推测现在/正在发生的动
作/过去发生的动作。 He must have a car now. (现在)他一定有辆小汽 车。
He must be doing his exercises in the classroom. (正在进行)他一定在教室里做练习。 He must have finished the work.(过去发生)他一 定已完成了工作。
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情态动词+have+done” 表“本来应该…” 使用情况分析
一、should have done过去本来应该 (而实际上并没有…)
should not have done 本不应该 …而实际上却已经…” 含有指责对方或自责的含意。
如:1、We should have studied last night, but we went to the concert instead . 我们昨晚本应学习的 ,但我们却去看音乐会了。(实际上没有学习)
情态动词表推测 (2)优秀课件
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情态动词表推测
肯定推测: must, may, might, could, would, should, ought to
否定推测: can not, could not, may not, might not.
疑问推测: can, could
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