九年级英语全册 Unit 7 Teenagers should be allowed to choose their own clothes语法透视 含情态动词的被动语态素材 （新版）人教新目标版（通用）

Unit 7 Teenagers should be allowed to choose their own clothes【语法透视】：含情态动词的被动语态1.含情态动词的被动语态的基本结构为“情态动词+be+及物动词的过去分词”。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。2.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 clean the classroom every day. The classroom should be cleaned every day. 3.句式的转换(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 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。典例题解例1Teenagers should to choose their own clothes. A. allow B. to allow C. be allowed D. allowed解析C。主语teenagers是动作allow的承受者，再根据should确定要用情态动词的被动语态，即“情态动词+be+过去分词”。例2-What should we do first if we want to develop our village?-A lot of new roads , I think. A. have to build B. must build C. have built D. must be built解析D。new roads是动作build的承受者，应用被动语态。含must的情态动词的被动语态为“must+be+情态动词”。例3This 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 kept解析D。根据句意，主语food是动作的承受者，用被动语态，而空格后的cool是形容词，而“keep+某物+形容词”意为“使保持状态”，故选D。例4Smoking _ in public places, so dont smoke here. A. allows B. is allowed C. doesnt allow D. isnt allowed解析D。主语smoking是动作allow的承受者，排除A和C。由so dont smoke here可知这儿禁止吸烟，故选D。语法精练 I. 用括号内所给单词的适当形式填空。1.How many magazines _(can borrow) in your library every week?2.In many countries, teenagers under 18 _(should not allow) to go into Internet bars. 3.Some people think trees _(should plant) on Tree planting Day only. 4.The flowers _(must water) every day. 5.A dictionary _(can use) in the exam. II.同义句转换，每空一词。1.Students should clean their classroom every day. Their classroom _ _ _ every day. 2.Can you mend this radio?_ this radio _ _?3.We should not allow fifteen-year-olds to work at night. Fifteen-year-olds _ _ _ to work at night. 4.Who should be asked to volunteer at your local school? Who should _ _ to volunteer at your local school?5.They grow tea in the southeast of China. Tea _ _ in the southeast of China. III.根据汉语提示，完成下列句子。1.Many tall buildings _(可以看见)everywhere in our city. 2.All the work _(应该做) as soon as possible. 3.Waste-paper _(不应该扔)here. 4._rice_(能种植) in winter?5._the letters _(必须打) this afternoon?参考答案I.1.can be borrowed 2.shouldnt be allowed 3.should be planted 4.must be watered 5.can be used II.1.should be cleaned 2.Can,