初中語(yǔ)法講解：情態(tài)動(dòng)詞(1)-1

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[00:10.77]情態(tài)動(dòng)詞(Modal Verbs)

[00:19.50]情態(tài)動(dòng)詞表示說(shuō)話人對(duì)某一動(dòng)作或狀態(tài)的態(tài)度

[00:26.18]情態(tài)動(dòng)詞本身有一定的意義，如must,can表示“必須,能夠”，但不能單獨(dú)作謂語(yǔ)

[00:38.67]比如我們不能說(shuō)We must.He can.意義不完整

[00:45.51]要和動(dòng)詞原形一起連用，比如說(shuō)，We must go.He can swim.

[00:55.95]情態(tài)動(dòng)詞沒(méi)有人稱(chēng)和數(shù)的變化,比如說(shuō)you must,I must,he must

[01:07.93]常用情態(tài)動(dòng)詞：can,could,may,might,must,have to,will,shall,would,should,

[01:27.78]need,dare,ought to等

[01:45.23]can和could

[01:50.54]1 表示“能力”，“允許”等，在口語(yǔ)中代替may,表示許可

[01:59.27]Ms Wang can drive acar now.(表示能力)You can go now.(表示許可)

[02:22.71]The teacher said wecould play footballafter school.(表示許可)

[02:49.06]2 could可以代替can,表示語(yǔ)氣委婉

[02:53.75]Could you come herea little earliertomorrow?

[03:11.36]Could you help mewith my English?

[03:25.76]3 can與be able to兩者都可以表示能力，

[03:25.76]can只能用于現(xiàn)在時(shí)和過(guò)去時(shí)中，其他時(shí)態(tài)則用be able to來(lái)表達(dá)

[03:51.03]Everybody can/isable to do that work.

[04:09.81]They haven't beenable to finishreading the books.

[04:36.62]I said I would beable to visit afterthe SARS.

[05:08.10] can與be able to

[05:12.38]要表達(dá)由于某人的能力和努力而成功地做成一些難做的事情時(shí)，用be able to

[05:24.07]They didn't agreewith me at first,but I was able topersuade them.

[05:53.76]He was a good runnerso he was able toescape from thepolice.

[06:26.75]4 表示推測(cè)，常用于否定句或疑問(wèn)句中

[06:42.45]She's fat.She can'tbe a dancer.Can that man be ourteacher?

[07:37.81]Today is Sunday.Shecan't be working inthe office now.

[07:56.04]The ground is notwet at all.It can'thave rained lastnight.

[08:44.86]must和have to

[08:51.15]1 must表示“必須，應(yīng)該”，否定形式表示“不準(zhǔn)，禁止，不許可”

[09:06.66]The students mustobey the schoolrules.

[09:18.53]You mustn't playfootball in thestreet.

[09:36.02]Must we finish thework tomorrow?Yes,you must.No,you needn't