初中英语情态动词讲解练习和答案解析
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情态动词
一、考点、热点回顾
【词汇辨析】
1.sometimes/ some times/sometime/ some time:
sometimes: “有时”=at times. He is sometimes late for school.
some times: “几次” I have been to Nanjing some times.
sometime: “某一时刻” I bought it sometime last spring.
We’ll meet again sometime next week.
some time: “一段时间” We have to stay here for some time.
2. many/ much/ a few/ a little/ few/ little
(1)many修饰可数名词,much修饰不可数名词;都表示许多。例如:
许多书许多牛奶
(2)a few和a little都表示"有一点儿",侧重于肯定,相当于"some",但 a few修饰可数名词,
a little修饰不可数名词,例如:
He has a few friends in London.
---Would you like some coffee?
---Yes, just a little.
(3)few和little表示"几乎没有",侧重否定。few后接可数名词,little后接不可数名词。例
如:
He is a strange man. He has few words.
Hurry up, there is little time left.
【固定搭配】加-ing
be busy doing sth.忙于做…… eg: Mother is busy cooking.
look forward to + doing sth. 期待做…… eg: Tom l ooks forward to seeing his father again.
Thank you for (doing) sth. 为了…感谢你 eg: Thank you for your help.
have fun doing sth愉快地做某事 eg: I had great fun playing in the water.
=have a good time doing sth eg: I had a good time playing in the water.
have problem/trouble/difficulty (in)doing sth.做某事有困难
eg: I have difficulty finishing my homework in 2 hours.
【情态动词】又叫情态助动词。它们具有以下特点:
⑴ 它们必须与其他动词连用,即:情态动词+动词原形
表示说话人对所述动作的看法,如需要、可能、意愿或怀疑等。
⑵绝大多数情态动词没有人称和数的变化,即第三人称单数不加-s
(以be和have 开头的情态动词短语除外)。
⑶ 在意义上,情态动词具有“多义性”。
例:can既可表示能力,又可表示可能、允许等意义。
【情态动词的基本用法】
1. can的基本用法:
⑴表示体力或智力上的能力,即“能够,会”,可与be able to转换。
例:He can speak English. = He is able to speak English.
—Can you play basketball?
— No, I can’t.
如果表示将来具备的能力,要用will be able to。
例:If I have a good sleep, I will be able to do the problem.
⑵表示许可,主要用于口语,书面语一般用may。
例:—Can we go home now, please?
— No, you can’t.
You can only smoke in this room.
You can’t keep the library books for more than a month.
⑶表示“可能”,与may同义,但一般用在疑问句中。
例:What can he possibly want?
在否定句中,否定形式can’t表示推测“不大可能”。
例:Anybody can make mistakes.
The news can’t be true.
与第一、二人称连用时,还可以就可能的解决问题的方式或可能的行为提出建议。在这里,也可用could使语气婉转。
例:Can / Could we meet again next week? 下周我们可以再见面吗?
—What shall we do? 我们怎么办呢?
— We can / could try asking Lucy for help. ——我们可以请露茜帮忙试试看。
You can / could help me with the cooking. 你可以帮我做饭。
2. may的基本用法:
⑴表示“许可”,用can比较口语化。
例:You may / can come if you wish. 如果你想来,你就来。
You may not pick flowers in this park. 本公园内不许摘花。
(may not表示按规定不许可,如果用mustn’t则表示说话人不许可。)
—May I smoke here? 我可以在这里抽烟吗?
—No, you mustn’t.不行。(mustn’t表示明确的禁止。)
⑵肯定句中表示推测,“可能”。
例:It may rain tomorrow. 明天可能会下雨。
The news may not be true. 这个消息可能不会是真的。
注意:如果在疑问句中表示“可能”,通常用can。
例:Can it be true? 那会是真的吗?
Who can he be? 他究竟是谁呢?
⑶【注意】:—May I/we……?
—Yes, you may./—No, you mustn’t.
3. must的基本用法: