[00:10.28]1 shall作为情态动词用于第二、三人称，表示说话人的意愿，
[00:38.31]有“命令，警告，威胁，强制，允诺”等意思
[00:46.12]You shall do as Isay.
[00:56.76]Tell her that sheshall have the moneynext week.
[01:10.42]2 在疑问句中，shall用于第一、三人称，表示说话人征询对方的意见或请求指示
[01:21.07]Shall I turn on theradio?Shall he come atonce?
[01:50.69]3 should表示“劝告，建议”
[01:57.61]We should keep ourpromise.You should help eachother.
[02:20.14]You should have comehere earlier.
[02:39.83]We shouldn't haveleft the classroom w-ithout the teacher'spermission.
[03:10.88]4 should还可以表示“预测，可能”
[03:14.96]He should be here bynow.They should be onthe playground.
[03:36.25]will和would
[03:44.41]1 will表示“意志，意愿”，可以用于各种人称
[03:49.73]I will tell you allabout itHe will never gothere again.
[04:02.50]2 在疑问句中用于第二人称时，表示询问对方的意愿或向对方提出请求
[04:12.44]Will you have a cupof tea?
[04:16.52]His father will tryto mend the bikehimself.
[04:31.24]3 表示预料或习惯性动作，意思是“总是，惯于”
[04:38.69]Fish will die out ofwater.
[04:49.69]The girl will sitthere reading booksfor hours.
[05:03.35]4 would表示过去时间的“意志，愿望”，用于各种人称
[05:12.05]I promised that Iwould buy her a car.They said they wouldbe careful next time.
[05:37.77]5 would表示说话人向对方提出请求，语气委婉，指的是现在时间
[05:49.83]I would like(I'dlike)to study abroad.Would you like someapples?
[06:08.46]6 表示过去的习惯The little boy wouldsit like that forhours.
[06:22.30]Every Christmas wewould go and see him.
[06:39.86]ought to
[06:49.30]1 ought to表示应该做某事，与should相比，语气稍强
[06:58.43]We ought to take theteacher's advice.
[07:12.03]She ought to lookafter her studentsbetter.
[07:21.87]Ought they to startnow?Yes,I think theyought to
[07:40.38]He ought to be puni-shed,oughtn't he?
[08:02.17]2 ought to have done,ought not to havedone
[08:16.94]You ought to havethrown the coat away.(=but you did not)
[08:29.82]He oughtn't have hithim.(=but you did)
[08:57.47]情态动词练习填空
[09:07.79]1 You[needn't](not)talk so loud;I can hear you.
[09:28.88]2 You[shouldn't/oughtn't to](not)talk so loud;you'll wake the baby.
[09:55.12]3 Who[can]tell thedifference betweenthese two words?
