Unit 7 语法思维导图及专练-2023-2024学年九年级英语全一册基础知识专项讲练（人教版）

Unit 7 Teenagers should be allowed to choose their own clothes.（语法讲练） 【知识导图】 【要点拓展】 1.祈使句变为被动句时，用“Let+宾语+be+过去分词”句式；否定祈使句变为被动句时，用“Don’t let+宾语+be+过去分词”句式。 Keep the book on the desk. → Let the book be kept on the desk. Don’t put the knife here. → Don’t let the knife be put here. 2.主动形式表示被动意义的情况 （1）连系动词如smell、taste、feel、sound等，可以用主动形式表示被动意义。 The food smells delicious.食物闻起来很美味。 （2）表示主语特征、状态的动词如wash、write、sell、read、open、cut、keep、lock、clean等，可以用主动形式表示被动意义。 This kind of pens sells well.这种钢笔卖得好。 （3）表示开始、结束类的动词如start、begin、close、finish、stop、end等，可以用主动形式表示被动意义。 They ended the game with a score of 78-50.他们以78比50结束了比赛。 （4）在表示“需要”意义的need、want、require等词的后面加动名词，是主动形式表示被动意义，其含义相当于动词不定式的被动形式。 This desk needs repairing（=to be repaired）. 这张课桌需要修理。 Your coat needs washing（=to be washed）. 你的大衣需要洗一下。 （5）形容词worth后跟动名词的主动形式表示被动意义。 These books are worth reading.这些书值得一读。 The museum is worth visiting.那个博物馆值得参观。 【奇思巧计】 被动语态顺口溜 被动语态强调“宾”，用be加上“过去分”。 “be”要随着主语变，人称时态要弄准。 “行为对象”作主语，逻辑主语“by”来引。 原句若是双宾语，一变“主”来一保“宾”。 情态动词变“被动”，情态加be加过分。 若有“情态”后带to，变后有“to”才弄准。 时态人称be关键。 【同步检测】 一、单项选择 1．— Teachers should ________ carefully. — I think so. It’s a good way to study well. A．listen to B．be listened to C．be listening to 2．This Maths problem ________ out by Tom. A．can be easily work B．can easily be worked C．can is easily worked D．can easily worked 3．The dictionary mustn’t _______ from the library . A．take away B．taken away C．are taken away D．be taken away 4．—Mrs Watson, how long can the books from the school library ________? —At most two weeks. A．borrow B．keep C．be borrowed D．be kept 5．Attention, please! All the mobile phones ________ before the meeting starts. A．may turn off B．must turn off C．must be turned off 6．—Teenagers should ________ go swimming by themselves. —So it is. A．not allowed B．be not allowed to C．not be allowed to D．not be allowed 7．—I think our classroom must ________ every day. —Yes, but we can do it after school. A．clean B．cleaned C．be cleaning D．be cleaned 8．Do you think teenagers