should的用法
■表示“应该,应当”
He should work harder.他应该更加努力.
You should help your mother with the housework.你应该帮你母亲做家务.
Crime should be punished.犯罪应受惩罚.
Should I wear a coat?我要穿大衣吗?
■表示“可能,该(=will probably) ”
He should arrive soon他可能很快就到了.
The train should have already left.火车大概已经走了.
■表示“万一”
If it should rain tomorrow,don’t expect me.万一明天下雨,就不要等我了.
■表示“竟然”
It’s strange that he should be late.真奇怪,他竟会迟到.
■表示粗暴地拒绝一项建议、要求或指示
—What time does the film start?电影什么时候开始?
—How should I know?我怎么知道?
—Ann’s very unhappy.安非常不高兴.
—Why should I care?这管我什么事?
—Could your wife help us in the office tomorrow?你妻子明天能到办公室来帮帮我们吗?
—Why should she?She doesn’t work for you.她为什么就该去?她又不是为你们工作的.
■should加完成式：should have done表示“本应该做某事,但事实上却没有做”；shouldn’t have done表示“本不该做某事,但事实上却做了”.如：
You should have got up earlier.你本应该早点起的.
You shouldn’t have told him about it.你本不该把这件事告诉他的.
■should与ought to的比较
(1) 除表示“万一”“竟然”等只能用should外,表示“应该,应当”“可能”等,两者可互换,只是ought to的语气稍重.如：
You ought to/should work harder than that.你应当更努力地工作
She ought to/should finish it by next week.下星期她可能完成了.
You ought to/should have told him about it earlier.你本应该早点把这件事告诉他的.
You oughtn’t to/shouldn’t have wasted time like that.你本不该像那样浪费时间的.
(2) should 强调主观看法,而 ought to 强调客观要求.如：
We ought to go and see my mother in hospital tomorrow,but I don’t think we will.我们按理应当在明天去看看住院的母亲的,但我主认为我们不会去.
(3) 在公告、须知或条例中,出于礼貌,常用should.如：
You shouldn’t run alongside the swimming pool.不准在游泳池边奔跑.
(4) 在虚拟语气中只能用should.如：
He suggested that I should go there.他建议我去那里.
(5) 注意ought to的否定式与疑问式.如：
You ought not to do it.你不应该做此事.
—Ought he to start now?他现在该动身了吗?
—Yes,he ought (to) .是的,该动身了.
They ought to go now,oughtn’t they?他们现在该走了,对吗?