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Notes on the text
1. Dressed up as Father Christmas and accompanied by a ‘guard of honour’of six pretty girls,he set off down the main street of the city riding a baby elephant called Jumbo. 他打扮成圣诞老人，在由6个漂亮姑娘组成的“仪仗队”的陪同下，骑着一头名叫江伯的小象，沿着城里的主要街道出发了。
dress up: 装扮
guard of honour: 仪仗队
2. He should have known that the police would never allow this sort of thing. A policeman approached Jimmy and told him he ought to have gone along a side street as Jumbo was holding up the traffic. 他本该知道警察绝不会允许这类事情发生。一个警察走过来告诉吉米，他应该走一条小路，因为江伯阻碍了交通。
should/ought to +have done: 本该做却没有做
hold up the traffic: 阻碍交通
3. Of course,we should arrest him,but as he has a good record,we shall let him off this time. 当然，我们应该逮捕它，但由于它一贯表现很好，这次我们饶了它。
has a good record:记录良好，表现很好
let off: 饶恕
Key structures
should 和ought to 的用法
1.一般来说，should和ought to可以互换，但ought to语气上要更重些，更侧重于表达出于法令规则等客观情况而应该做某事。should则更强调个人意见和主观看法。
2. should/ought to+过去分词(done)表示本应该做但还没有做的动作
例句：I"m sorry I"m late. I should have taken(ought to have taken) a taxi.
Special difficulties
let的相关短语
1. let off: 饶恕 As he has a good record,we shall let him off this time.
2. let down: 失望 I expected him to help me,but he let me down.
3. let in: 让……进来 If anyone knocks at the door when I am out,don"t let him in.
4. let out: 让……出来 Who let the dog out?
附 本课单词听写表
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