高中情态动词讲解和分析

发布 2021-05-14 22:00:28 阅读 9208

一、情态动词的特征和形式。

a. 情态动词表推测。

1. 形式。

肯定的推测:must

否定的推测:can’t couldn’t

可能的推测:may might can could

疑问的推测:can could

2. 时间。

对过去:情态动词+完成式(h**e done\h**e been done)

对正在进行:情态动词+be doing

对现在或将来:情态动词+do

不同的“肯定”程度可按下列层次排列:

he is at home. (事实)

he must be at home.(非常肯定的推断)

he could be at home.(很可能)

he ought to be at home.(很可能)

he may be at home.(仅仅可能而已)

he might be at home.(或许, 非常不确定)

he isn't at home.(事实)

he can’t be at home.(一定不在家)

he couldn’t be at home.(很可能不在家)

he may not be at home. (比might可能)

he might not be at home.(也许不在家)

b.情态动词除ought to, used to等外,后面只接不带to的不定式。

1.情态动词+do

you shouldn't be so careless. 你不该这样粗心大意。

jessica told him yesterday she might not go on the trip.

杰西卡昨天告诉他,她可能不去旅行了。

difficulties can and must be overcome. 困难能够而且必须克服。

2.情态动词+be doing

she must be listening to pop music. 她肯定在听流行**。

you should be reviewing your lessons.你应该在复习功课。

my mother may/might be cooking now.妈可能正在做饭。

3.情态动词+h**e done

they might h**e visited the great wall. 他们可能参观过长城了。

he must h**e got up very early to catch the train. 他一定起得很早去赶火车了。

you ought to h**e come earlier. 你本该早一点儿来。

4.情态动词+be done

this word can also be used as a verb. 这个词也可以用作动词。

something must be done to stop pollution. 必须采取措施来制止污染。

the work ought to h**e been finished long ago. 这工作早就该完成了。

c. 情态动词第三人称单数一般现在时没有词形变化。

you ought to wear a raincoat. 你应该穿件雨衣。

she ought to wear a raincoat. 她应该穿件雨衣。

plants must h**e oxygen in order to live. 为了存活植物必须有氧气。

a plant must h**e oxygen in order to live. 为了存活植物必须有氧气。

d. 情态动词的时态并不是区分时间的主要标志。在一些场合中,情态动词的现在式和过去式都可以表示现在时间、过去时间或将来时间。

i'm afraid it might rain tonight.我看今晚可能要下雨。

could i borrow your thermos? 我可以借用你的热水瓶吗?

it's a nice day today. we could go for a walk. 今天天气不错,我们可以出去散散步。

e. 情态动词是互相排斥的,一般不允许两个意义相近的情态动词连用。

误】soldiers must h**e to obey orders.

正】soldiers h**e to obey orders. 军人必须服从命令。

正】soldiers must obey orders. 军人必须服从命令。

误】can i be able to borrow two books at a time?

正】can i borrow two books at a time?我能一次借两本吗?

正】will i be able to borrow two books at a time?我能一次借两本书吗?

二、情态动词的意义和用法。

a. may和might

1. 表示请求、许可,常译为“可以”。

在口语中可用can, could代替may,但在正式场合用may。表示允许时,也可用might

代替,might不表示过去时,而是表示口气比较婉转。

you may take this seat if you like. 如果你喜欢可以坐这个位置。

may/can /could/ might i h**e a talk with you? 我可以和你谈谈吗?

---may/might i come into the room to see my mother? 我可以进房间看我母亲吗?

---no, you mustn't. she needs to h**e a good rest. 不,你不能进。她需要好好休息。

提示:may i ..问句常见的肯定回答和否定回答。

肯定回答yes, please.

certainly. yes, of course. sure. go ahead, please.

否定回答 no, you can't. (最常见)

no, you mustn't. (具有强烈禁止的意思)

please don't.

you'd better not.

i don't think you can.

i'm sorry it's not allowed.

2. 表示推测,可译为“可能,也许”。

your math teacher may/might be in his office.

你们的数学老师可能在办公室里。(一般情况下,might表示的可能性很小)

the light isn't on. it may/might be broken. 那盏灯没有亮,它可能坏了。

there may might be some ink left in the bottle. 瓶子里也许还剩点儿墨水。

注意:用may表示推测一般不用于疑问句,在疑问句中通常用can来代替。

can he be at home? 他可能在家吗?

---can it be true? 这可能是真的吗?

---it may be, or may not be. 可能是,也可能不是。

3. 用在目的状语从句中,构成谓语。

he wants to take a taxi so that he may get there in time.

他想坐出租车,这样他就能及时到达那里。

i arrived at the airport earlier in order that i might meet him.

我早早地就到了机场为了能接到他。

4. 有时可以用于祈使句表示祝愿。

may you succeed. 祝你成功

may you be happy. 祝你快乐。

may that day come soon.希望这一天早日到来。

b. can和could

1.表示能力,可译为“能,会”。

i can swim. 我会游泳。

emily can dance well and her mother could dance well when she was young.

艾米丽舞跳得很好,她妈妈年轻时舞跳得也很好。

the cinema can seat 1,000 people. 这电影院能容纳1,000人。

i could not read such an easy book when i was 7 years old.

我七岁时连如此简单的书我也看不懂。

2. 表示允许、许可,常用在口语中。could比can语气上要客气。

---could i use your dictionary? 我可以用一下你的字典吗?

---yes, go ahead. 可以,用吧。

(或yes, you can. 但不能说yes, you could.)

could / can you tell me how to get to the zoo? 劳驾,你能告诉我怎么去动物园吗?

he asked me whether he could take the book out of the reading room.

他问我可不可以把书带出阅览室。

3.表示推测,可用于肯定句(can罕见)、否定句和疑问句,但更常见于疑问句或否定句。在此种用法中can和could没有时态的区别,只是表示可能性的大小,can表示推测的可能性比could大。

can he be ill at home? 他会是生病在家吗?

can the story be true? 这个故事会是真的吗?

he cannot be at home. 他不可能在家。

you mustn't smoke while you are walking around in the woods. you could start a fire.

在林子里走时一定不要吸烟,那样可能会引**灾。

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