人教版英语初中九年级上册知识讲解，巩固练习（教学资料，补习资料）：Unit 7 第3课时Grammar（含答案解析）

/ 重点 含有情态动词的被动语态 构成 含有情态动词的被动语态的结构为＂情态动词+助动词be+及物动词的过去分词＂情态动词指can, may, must, should等。 ?The flowers should be watered.应该给花浇水了。 ?Tables can be made of stone.桌子可由石头做成。 ?Teenagers should be allowed to go out with their friends.青少年应该被允许和朋友外出。 句式 （1）肯定形式：主语+情态动词+be+及物动词的过去分词+by短语（by短语可省略）。 （2）否定形式：主语+情态动词+not +be+及物动词的过去分词。 （3）一般疑问句：情态动词+主语+be+及物动词的过去分词？ （4）特殊疑问句：特殊疑问词+情态动词+主语+be+及物动词的过去分词？ ?Waste paper should not be thrown here. 废纸不应该被扔在这里。 ?Must the trees be watered now? 这些树必须现在浇水吗？ ?Should it be done by Li Ming? 这件事应该是李明干吗？ 【警示】如果不强调动作的执行者，by短语常可省略。 三、含有情态动词的主动句与被动句之间的转换 含有情态动词的主动句变为被动句时，要把主动句中的宾语变成被动句中的主语；主动句中的谓语变为＂情态动词+be+及物动词的过去分词＂；主动句中的主语变为介词by的宾语（如果不强调动作的执行者，by短语常可省略）。 主动句：She must clean her room every day. 主语 谓语 宾语 被动句：Her room must be cleaned (by her) every day. 【典例】1. Teenagers should _____ to choose their own clothes. A. be allowed B. allow C. allowed D. to allow 【答案】A / 2. More trees must _____ here. A. be planted B.pl/anted C. To plant D. plant 【答案】A 【解析】句意：在这儿更多的树需要被种。此题考查含有情态动词的被动语态，根据句意可知选A。 四、含有情态动词的被动语态的句子结构 句式 结构 例句 肯定句 主语＋情态动词＋be done(＋by＋宾语). The work should be finished by ten.这项工作应该在十点之前完成。 否定句 主语＋情态动词＋not＋be done (＋by＋宾语). Those books mustn't be taken out of the library.不准把那些书带出图书馆。 一般疑 问句 情态动词＋主语＋be done(＋by＋宾语)？ May these rooms be cleaned tomorrow？这些房间可以明天打扫吗？ 特殊疑 问句 特殊疑问词＋情态动词＋主语＋be done(＋by＋宾语)？ When should these books be sent to the children in mountain areas？这些书应该什么时候送给山区的孩子们？ 【典例】Hurry up! The exam must _____ in 100 minutes. A. finish　 B. be finished　 C. is finished / 基础训练 一、将下列句子改为被动语态。 1. We must speak to the old people politely. Must the old people _____ _____ to politely? 2. Dad cleaned the car yesterday. The car _____ _____ by Dad yesterday. 3. We often water these young trees These young trees _____ often _____ by us. 4. The boy broke the window yesterday. The window _____ _____ by the boy yesterday. 5. I will give him a camera as a present. A camera _____ _____ _____ to him by me as a present. 二、单项选择。 1. —Do you believe there are aliens? —I’m afraid not. I don’t think aliens _____ in space. A. can be found B. can find C. can be founded D. can’t be found 2. —Will you go to the dinner party tonight? —I won’t go unless Sue _____. A. will be invited B. can be invited C. invited D. is invited 3. I don’t think sixteen-year-olds should _____ to go to net bars. A. allow B. be allowing C. allowed D. b ... ...