内容正文:
情态动词知识点和考点
知识回顾:
动词分类
①实义动词:
love, read,write,run,have...
②系动词:
1.be(am,is are,was,were)
2.感官类(smell,sound,feel,taste,look)
3.变化类(become,go,turn,get...)
4.表现类:(seem,apprear,look...)
5.持续类:keep,remain...
③情态动词:
may,can,could,must,need...
④助动词:
1.be+
doing
done
2.have done
3.do(does,did)
4.will,would,shall,should
考点一:情态动词概念和用法
情态动词表示说话者的情感、态度和语气。它们本身有一定的意义,但没有人称和数的变化,不能单独作谓语,须和动词一起构成句子的谓语,后面必须跟动词原形一起构成谓语.例如:I can swim. /We must leave now.
常见情态动词:(熟记)
Can/could可以,能,可能
be able to能够
may/might可能,也许
shall请求对方允许
ought to/ should应该
will/would请求,建议
need需要
must必须,应该(猜测)
have to不得不(有时态人称变化)
used to过去常常做某事
had better最好
would rather宁愿
dare敢于
考点二:情态动词后面用动词原形
1.She should (go) to bed early.
2. I will (go)there tomorrow.
3.He should (do) some work,but he doesn't want to.
4.Jim can’t (speak) English.
5.She may (be) in the classroom.
6.I know I must (study) hard.
考点三:Mustn’t 和needn’t的意思
Must 表示“必须,应该”。Mustn’t表示“禁止“,在回答must开头的句子时,否定常用“needn’t,不需要”
例如:—Must I be home before eight o’clock?我必须8点前回到家吗?
—Yes,you must.是的,你必须。
-No,you needn’t./You don’t have to.不,你不需要。√
-No,you mustn’t.不,你禁止。×
练习:
1.—Must I do my homework at once? —No,you . A.needn’t B.mustn’t C.can’t D.may not
2.You play football in the street.It’s too dangerous.
A.shouldn’t B.needn’t C.mustn’t D.may not
A
C
考点四:情态动词+have+done形式,表示“推测或判断过去的情况”
1. must have done表示“⼀定做了”
例:He must have gone home.(他肯定已经回家了。)
2. could have done,表示“过去能做⽽未做”(虚拟语⽓,与过去事实相反)
例:He could have simply walked away.(他本可以直接⾛掉的。)
3. may/might have done表示“或许已经做了”,强调“推测”。
例:It's been seven years. She may/might have forgotten me.
(已经过了7年了。她很可能已经忘记我了。)
4. should have done/ought to have done表示“本应该做⽽没有做”,否定形式则表示“本来不应该做但却做了”(虚拟语⽓,与过去事实相反)
例1:You should have told/ought to have told me the truth.(你本应该跟我说实话。)
例2:You shouldn’t have told/ought not to have told me the truth.(你本不应该跟我说实话。)
5. needn’t have done表示“本