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情态动词用法情态动词 | 词义&用法 | 注意事项 | 特殊用法 |
cancould | 1.表具备某种能力 | Can表现在能力;Could表示过去能力.可用be able to代替;was/were able to 表示成功做了某事 | (1)表惊异、怀疑、不相信、不耐烦等。(此意常用于否定句、疑问句或惊叹句语气)Can/Could this be true?(2)can not…tooenough表示"无论怎样``````也不过分","越``````越好":You can't be too careful.你越细心越好 |
2.表请求和允许 | ①请求用could 语气委婉②答语不用 could. | ||
3.表"可能性" | ① can用于否定和疑问句(could不限)② can (be)表示有时候会(常与sometimes, at times 连用) | ||
maymight | 1.表请求和允许 | ①请求用might语气更委婉。②允许时用may,表示"可以"(表示允许时不用might)。 | (1)may/might well+V原形:表"完全可能,,很可能"= be very likely to:He may well be proud for his son.(2)may/might as well+V原形:"最好,蛮可以,倒不如"You may as well stay here over night. |
2.表可能性"也许" | 此意常用于肯定句。(might可能最小) | ||
3表祝愿 | 固定句型为"May+主语+V原型":May you succeed! | ||
must | 1.表"必须" | ① must多表主观、现在/将来义务; have to多表客观、过去义务② mustn't表"禁止";否定用needn't / don't have to | (1)表示必然结果:All men must die.人固有一死。(2)表示一种与说话人愿望相反、不耐烦的感情色彩,可译为"一定要、偏偏、非要":If you must know, her name is Mary. |
2.表推测:"肯定是、准是" | 只用于肯定句。在否定句/疑问句中用can/could | ||
willwould | 1.表意愿,决心等 | Would此时为will过去式,无意义差别 | (1)will表命令(说话者确定命令一定会得到执行)或允诺:You will report to me afterwards.(命令)They will get enough money from me.(允诺)(2)可用于祈使句附加疑问句(反义疑问句):(此时would比will委婉) Don't go now, will you?(3)would短语:would rather/would prefer宁愿;would like/would love喜欢/想要 |
2.表经常性,习惯性,倾向性, | Would表过去反复的动作/某种倾向(相对于used to无"现已无此习惯"之义。) | ||
3.表功能,性质 | 叙述真理:The tree will livewithout water for 3 months. | ||
4.表估计:"想必,大概"(只时态区别) | 此意表对目前事物的预料。That will be the postman ringing.(would表示过去/现在;will表示现在/将来) | ||
5.表"请求/要求"(Will you?) | 此意用于疑问句,常与you连用Will you give me a piece of paper? | ||
shall(shan't) | 1.表征求意见("好不好") | 用在第一、三人称Shall the reporters wait outside or what? | 点2其他示例:He shall have the book when I finish reading.(允诺)You shall fail if you don't work harder.(警告)You shall come at once.(命令) |
2.表允诺、威胁、警告、命令或根据规定有义务做 | 用于第二、第三人称Passengers shall not talk with the driver while the bus is moving | ||
3.表规章、法令、预言:"必须" | 用于所有人称Every competitor shall wear a number | ||
shouldought to | 1.表示道义上的责任,义务或要求, | 有时表示劝告:You ought to /should pay more attention to what your lawyer says. | (1)should 用于疑问句中表示说话人对某事不能理解,惋惜,感到意外,赞叹,愤怒、惊异等感情,意为"竟会",有时也用于陈述句中(2)Should还可以用在if引导的条件从句,表示一件事听起来可能性很小,但也不是完全没有可能,相当于"万一"的意思。 |
2.表示推测和可能性,是" (按理说)应该"之意 | 肯定的语气没有must用于推测时强This pen ought to /should be yours. | ||
3.表示说话人的一种谦逊,客气,委婉的语气 | 此意常用于第一人称时:You are mistaken , I should say . (依我看你是搞错了) |
情态动词没有人称和数的变化,情态动词后面跟的动词须用原形,否定式构成是在情态动词后面加“not”。个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气,时态性不强,情态动词可以用于过去,现在或者将来。情态动词属非及物动词,所以没有被动语态。
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