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1、Unit 7 Teenagers should be allowed to choose their own clothes【学习目标】1、 语法：含有情态动词的被动语态2、 重难点： 能听懂含有情态动词的被动语态结构的句型。学会谈论语序和不允许做的事情。【预习合作探究】1、I dont think sixteen-year-olds should be allowed to drive.(1)sixteen-year-olds 名词，意为：16岁的青少年，相当于sixteen-year-old boys and girls辨析 sixteen-year-olds sixteen-year-o
2、ld 与 sixteen years oldsixteen-year-olds 16岁的青少年 n 在“基数词-名词（单数）-形容词”结构中，形容词后加-s 表示一类人或事物 Sixteen-year-olds should be allowed to go out at night.sixteen-year-old 十六岁的 是由“基数词-名词（单数）-形容词”构成的复合形容词，在句中通常作前置定语，修饰名词。My pen pal is a sixteen-year-old boy.sixteen years old 十六岁， 用来描述人的年龄，常句中用作表语。My brother is s
3、ixteen years old.(2) allow ( to let sb do sth ) vt 意为：允许，准许，常用于以下结构中： allow sb to do sth 允许某人做某事 The teacher allowed him to go into the classroom. allow doing sth 允许做某事 We dont allow smoking in public places. be ( not ) allowed to do sth (不)被允许做某事 Passengers are not allowed to smoke.2、Sixteen-year-o
4、lds should be allowed to get their ears pierced.【解析1】should be allowed 是情态动词的被动结构，它是由“情态动词+be+及物动词的过去分词”构成。Many trees should be planted on the mountains. 应该在树上植许多树。Students should be allowed to go to school by bike.应该允许学生们骑自行车上学。把含情态动词的主动句变成被动句，即把“情态动词+动词原形”改为“情态动词+be+过去分词”，此时，作主语的要用动词承受者。We should
5、clean the classroom every day. The classroom should be cleaned every day. 该结构的句式转换：1.否定句：在情态动词后加not就行。These books cant be read for children. 这些书孩子们不能读。2.一般疑问句：直接将被动语态的陈述句的情态动词提到的句首。Should Ann be allowed to wear her own clothes? 应该允许安选择自己的衣服吗？3.特殊疑问句：由疑问词加上含有情态动词的被动语态的一般疑问句构成。When must my homework be
6、 handed in? 我的作业必须何时交？4.对含有情态动词的被动语态的一般疑问句的回答， 一般应保留原句中的情态动词，但must表示“必须”时，其否定回答用neednt。Should my homework be finished today? 我的作业应在今天完成吗？Yes, it should./No, it shouldnt. 是的，应在今天完成。/不，不应在今天完成。Must the room be cleaned right now? 房间必须马上打扫吗？Yes, it must./No, it neednt. 是的，必须立即打扫。/不，不必立即打扫。【解析2】get ones
7、ears pierced：打耳洞（此处get 为使役动词，相当于make或者have,意为“使，让”）get/ have+ 宾语+ 过去分词：“使某事被做”或“让某人做某事”Youd better go and get your hair cut. Its too long.【形成性检测】I. 单项选择。1) _should not be allowed to go out at night.A.Twelve-years-old B.Twelve-year-oldsC.Twelve year oldD.Twelve years olds2) I _to have a part-time job
8、.A.am not allowB.not allow C.dont allowD.am not allowed3) The teachers think students should _ to their homework with friends.A. are allowedB. are allowing C. be allowedD. be allowing4) He cant speak English, I cant, _. A. tooB.either C. alsoD. neither5) My father stopped smoking a year ago.A. liked
9、 smokingB. gave up smokingC. gave in smokingD. began smoking6） This kind of food_ cool, clean and dry according to the instruction. A. should be carried B. must be put C. should be placed D. must be kept7) Did you have anyone _ the trees?Yes, I had the trees _. A. to water; water B. to water; watered C. water; to be watered D. water; wateredII. 英汉互译1. 这在博物馆里是不允许的。_.2. 我认为16岁的孩子不应被允许开车。_.3. Students must not be allowed to have part-time jobs._.4. Do you think we might be allowed to take photos if we dont use a bright light?_
