情态动词有哪些

Question

如题所述

Answer 1

情态动词有:
can,could,may,might,ought to,have to,need,shall,should,will,would,dare
情态动词有can (could),may (might),must,have to,shall (should,will (would),dare (dared),need (needed),ought to等.情态动词无人称和数的变化；不能单独使用,必须与其后的动词原形构成谓语
一、 can,could
1) 表示能力（体力、知识、技能）.
Can you lift this heavy box?（体力）
Mary can speak three languages.（知识）
Can you skate?（技能）
此时可用be able to代替.Can只有一般现在时和一般过去式；而be able to则有更多的时态.
I’ll not be able to come this afternoon.
当表示“经过努力才得以做成功某事”时应用be able to,不能用Can.如：
He was able to go to the party yesterday evening in spite of the heavy rain.
2) 表示请求和允许.
---Can I go now?
--- Yes,you can./ No,you can’t.
此时可与may互换.在疑问句中还可用could,
might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中.
---- Could I come to see you tomorrow?
---- Yes,you can.( No,I’m afraid not.)
3) 表示客观可能性（客观原因形成的能力）.
They’ve changed the timetable,so we can go by bus instead.
This hall can hold 500 people at least.
4) 表示推测（惊讶、怀疑、不相信的态度）,用于疑问句、否定句和感叹句中.
Can this be true?
This can’t be done by him.
How can this be true?
二、 may,might
1) 表示请求和允许.might比 may语气更委婉,而不是过去式.否定回答时可用can’t
或mustn’t,表示“不可以,禁止”.
----Might/ May I smoke in this room?
---- No,you mustn’t.
---- May/Might I take this book out of the room?
---- Yes,you can.(No,you can’t / mustn’t.)
用May I...征徇对方许可时比较正式和客气,而用Can I...在口语中更常见.

Answer 2

Answer 3

常见的情态动词有：can (could) ,may (might), must ,shall (should), will (would), dare (dared) , need 等,另外,have to、had better 也当作情态动词使用。情态动词后面必须加 动词的原形。

Answer 4

shall should would can could
may might
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