九年级英语第二十一单元

　　②行动可以持续整个时期或只发生在这个时期的某一时刻。如：

　　It rained all Monday but stopped raining during the night . 星期一整天下雨，但夜里雨停了。 ( 在某一时刻 )

　　He was ill for a week , and during that week he ate nothing .

　　during 与 for 的区别：

　　during 表示什么时间发生了什么事。for 表示这件事持续了多长时间。

　　There was a storm during the night ; it rained for three or four hours . 夜里暴风雨大作，雨一直下了三四个小时。

　　My father was in hospital for six weeks during the summer . 我父亲在夏天住了六个月医院。

　　ago 不用来表示动作和情况的持续时间，也不用来表示动作是什么时候开始的。ago 只表示过去的事情是什么时候发生的。但我们用的是从现在往过去追溯的“倒数法”，而不说出具体日期。ago 要和过去时态连用。如：

　　I saw him three days ago . 我三天前看见他的。 ( 从现在起倒数的三天 )

　　I caught this cold two weeks ago .

　　注意ago 是“自今…之前”，before 是“自过去…之前。”

　　25 . either … or 与 neither … nor 和 both … and 的区分

　　①either … or … ( 或者…或者… ) ，neither … nor … ( 既不…也不… ) ，这是两组表示选择的关联连词，均用来连接两个在语法功能上相同，在结构上相称的并列成分。当它们连接并列主语时，谓语动词的人称和数量常与最邻近的主语 ( 即 or 或 nor 后面的名词 ) 保持一致。如：

　　Either you or she is correct ( right ) . 或者你对，或者她对 ( 不是你对，就是她对 ) 。

　　②either … or 连接两个或两个以上的分句或并列成分，提供两种或两种以上的可能性。如：

　　Come either today or tomorrow .

　　③neither 或 nor 单独使用时，后面所接句子的主语和谓语要倒装。如：

　　You don\'t know his address , neither do I .

　　both … and 表示“两者都”，“既……又……”，是 neither … nor 的反义词组。试比较：

　　It was both cold and wet .

　　It is neither cold and hot .

　　Both John and Mary were there .

　　25 .购物时的交际用语

　　( 1 ) 售货员招呼顾客，提供服务时的用语：

　　What can I do for you ? / Can I help you ?

　　( 2 ) 顾客表示想买什么时的用语：
　　
　　I\'d like to buy / get… 我想买…… / I want… 我要……/ I\'m looking for…我在找……/ May I have a look at… ? 我可以看看……吗 ? / Have you got… ? 你 ( 们 ) 有……吗 ?

　　( 3 ) 谈论尺寸、大小、颜色、价格时的用语：

　　What size / colour / kind do you want ?

　　I\'m afraid we haven\'t got…，but we\'ve got…

　　Do you have any other kind / size / colour ?

　　How much / many…do you want ?

　　What about…… ?

　　That pair looks nice .

　　May / Can I try it / them on ?

　　Try on , please .

　　How much is it ? / How much does it cost ?

　　That\'s a bit / too expensive .

　　It\'s too expensive . I don\'t think I\'ll take it .
　　
　　Have you got anything cheaper ?

　　That\'s cheap / fine / nice . I\'ll have / take it .
　　
【 妙文赏析 】

　　Doctor\'s Advice

　　Once an old man went to the hospital to see a doctor . After having examined him carefully , the doctor said , “It\'s useless for you to take any medicine because no medicine will help you . You\'d better have a good rest . Go to stay in a quiet country place for a month , go to bed early , drink some milk , walk a lot and smoke only one cigar a day . ”

　　“Thank you very much , ”said the old gentleman , “I shall do everything you say . ”

　　Two weeks later , the old man came to the doctor again . “How are you ? ”said the doctor , “I\'m very pleased to meet you . You look much happier . ”

　　“Oh , doctor , ”said the old man , “I feel quite well now . I had a good rest . I went to bed early . I drank much milk . I walked a lot . Your advice certainly helped me . However , you told me to smoke one cigar a day . One cigar a day almost killed me at first . It\'s no joke to start smoking at my age , you know . ”

【 思维体操 】

　　下面是与购物有关的三个谜语，请猜一猜。

　　1 . Mary\'s mother asked her to buy something .

　　She said , “The thing is a five - letter word . Its first letter is in paint and also in draw . Its second is in peace but never in war . Its third is in up but not in down . It fourth is in village but not in town . Its fifth is in dress but not in suit . The whole is a most delicious fruit . ”

　　Mary thought for a minute , then she knew what her mother wanted her to buy . What is it ?

　　2 . Mary asked her mother how many she needed to buy . Her mother said . “The number is between one and ten . If you double the number , the result will be the same as if you added two to it . What is the number ? ”

　　3 . Two women went shopping . One spent ten dollars more than the other , and tog

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