1、=【 ;精品教育资源文库 】 = 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 don t 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
2、析 sixteen-year-olds sixteen-year-old 与 sixteen years old sixteen-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 yea
3、rs old 十六岁， 用来描述人的年龄，常句中用作表语。 My brother is sixteen 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 don t allow smoking in public places. be ( not ) allowed to do sth (不 )被允许做某事 Pass
4、engers are not allowed to smoke. 2、 Sixteen-year-olds 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
5、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 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。 =【 ;精品教育资源文库 】 = 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 ow
6、n 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 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 needn t。 Should my homework be finished today? 我的作业应在今天完成吗？ Yes, it should./No, it shouldn t. 是的，应在今天完成。 /不，不应在今天完 成。 Must the roo
7、m be cleaned right now? 房间必须马上 打扫吗？ Yes, it must./No, it needn t. 是的，必须立即打扫。 /不，不必立即打扫。 【解析 2】 get one s 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” You d better go and get your hair cut. It s too long. 【形成性检测】 I. 单项选择。 1) _should not be allowed to
8、go out at night. A.Twelve-years-old B.Twelve-year-olds C.Twelve year old D.Twelve years olds 2) I _to have a part-time job. A.am not allow B.not allow C.don t allow D.am not allowed 3) The teachers think students should _ to their homework with friends. A. are allowed B. are allowing C. be allowed D
9、. be allowing 4) He can t speak English, I can t, _. A. too B.either C. also D. neither 5) My father stopped smoking a year ago. A. liked smoking B. gave up smoking C. gave in smoking D. began smoking 6） This kind of food_ cool, clean and dry according to the instruction. A. should be carried B. mus
10、t be put C. should be placed D. must be kept 7) Did you have anyone _ the trees? =【 ;精品教育资源文库 】 = Yes, I had the trees _. A. to water; water B. to water; watered C. water; to be watered D. water; watered II. 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 don t use a bright light? _
