be supposed to /be expected to的用法it作形式主语-备战2025-2026学年九年级英语上学期期末语法全解（人教版）

ENGLISH-初三全一册资料（人教版） Chapter1 be supposed to/be expected to的用法，it作形式主语 考频分析 be supposed to/be expected to的用法及it作形式主语是中考英语句法的重要模块，考频占句法总量的 15%左右，贯穿试卷核心题型：单项选择(1-2题)、完形填空(1-2题)、语法填空(1-2题)、书面表达 (高频考察，直接影响句子结构规范性与表达准确性)。在语境理解类题目中，be supposed to/be expected to的语义辨析及t作形式主语时真正主语的逻辑关系往往是解题关键。 考查内容 中考对"oe supposed to/be expected to的用法及it作形式主语”的考察聚焦三大维度，覆盖基础用法与语 境应用 ·基出结构辨析：be supposed to与be expected to的语义侧重（理应/被期望）、人称搭配及否定形式；it 作形式主语时”it+be+adj.n.+todo/that从句”的基本句型结构； ·语境应用匹配：根据上下文语境选择be supposed to/be expected to表达不同语气，识别真实主语为不 定式或从句时t作形式主语的句式； ·句式转换与改写：主动语境下be supposed to/be expected to的同义替换，将真正主语后置的句子改写 为it作形式主语的句型。 精讲精练 知识点一：be supposed tolbe expected to的用法及it作形式主语 ·be supposed to的用法（表示“应该；被期望”，强调按规定或习惯应做某事） -基本结构：主语+be supposed to+动词原形 -例句：You are supposed to arrive on time.(你应该准时到达。)口He is supposed to finish his work today..(他今天应该完成工作。) -否定形式：be not supposed to(不应该)→例句：You are not supposed to smoke here.(你不应该 在这里抽烟。) ·bee邓ected to的用法（表示“被期望；预计”，强调他人或外界的期望） -基本结构：主语+be expected to+动词原形 -例句：口She is expected to win the competition.(她被期望赢得比赛。)The train is expected to arrive at8:00.(火车预计8点到达。) ·t作形式主语（代替真正主语，避免句子头重脚轻，真正主语通常为动词不定式或从句） -基本结构：t+be supposed to be expected to+动词原形+真正主语(to do sth.) -例句：口It is supposed to rain tomorrow.(明天应该会下雨。)口It is expected to take two hours to finish the task.(预计完成这项任务需要两小时。) 【即学即练】 1.【be supposed to用法】根据句意选择正t确形式：You一(be supposed to)wear a seat belt when driving. 2.【be expected to用法】完成句子：The new hospital_(expect))to open next month. 3.【it作形式主语】单项选择：_is supposed to snow tonight. A.This B.That C.It D.There 4.【否定形式】将句子改为否定句：You are supposed to talk loudly in the library..→ 5.【句式辨析】be supposed to强调一，be expected to强调一o 初三|英语|人教版 ENGLISH-初三全一册资料（人教版） 知识点二：it作形式主语与be supposed to be expected to的搭配及被动语 态应用 ·t作形式主语的基本结构（代替不定式或从句作真正主语，使句子平衡） -口结构：lt+be supposed to be expected to+动词原形+真正主语(to do sth./that从句) -口例句： *It is supposed to be sunny tomorrow.(真正主语：to be sunny tomorrow) *It is expected that the meeting will last two hours.(真正主语：that从句) ·一般现在时（表示客观预期或常规性安排） 一口主动语态（无被动，因t为形式主语，真正主语为不定式） *结构：lt+is supposed to /is expected to+动词原形+其他 *例句： ·It is supposed to rain every afternoon in summer.(夏季下午通常应该会下雨) ·It is expected to take30 minutes to walk to school.(预计步行到学校需要30分钟) -口被动语态（需转换为其他结构，如people作主语的主动语态或that从句） *转换示例： ·主动：People expect it to be cold tomorrow.(人们预计明天会冷) ·被动：It is expected that it will be cold tomorrow.(预计明天会冷) ·一般过去时（表示过去未实现的预期或计划） 一口主动语态 *结构：t+was supposed to was expected to+动词原形+其他 *例句： ·It was supposed to be a holiday yesterday,but we had to work.(昨天本该是假日，但我们必须工 作) ·It was expected to cost$100,but it was more expensive.(预计花费100美元，但实际更贵) -口被动语态（常用that从句结构） *结构：t+was expected that+主语+would do/was supposed to be+过去分词 *例句： ·It was expected that the project would be finished last week.(预计项目上周会完成) ·It was supposed to be completed by John.(本应由约翰完成) ·一般将来时（表示对未来情况的预测） 一口主动语态 *结构：It+will be supposed to will be expected to+动词原形（较少用，多直接用将来时） *替代结构：It is expected that+主语+will do *例句： ·It is expected that the new park will open next month.(预计新公园将在下个月开放) 一口被动语态 *结构：It+is expected to be+过去分词that从句 *例句： ·It is expected to be built by2025.(预计将在2025年前建成) ·It is expected that the bridge will be completed soon.(预计大桥即将完工) ·现在完成时（表示持续到现在的预期或安排） 一口主动语态 *结构：t+has been supposed to/has been expected to+动词原形（较少用） *常用结构：It has been expected that+主语+have/has done *例句： ·It has been expected that they would arrive since morning.(从早上起就-直预计他们会到达) 一口被动语态 *结构：t+has been expected to be+过去分词 *例句： ·It has been expected to be finished for weeks.(几周来一直预计会完成) ·注意事项 -口be supposed to强调按规定或习惯应发生的事，be expected to强调外界预测或期望 -口否定形式：It is not supposed to happen.(不应该发生)It is not expected to occur.(预计不会发 生) -口疑问形式：Is it supposed to be easy?(这应该很容易吗？)/Is it expected to rain？(预计会下雨吗？) 知识点三：it作形式主语与be supposed to/be expected to的句型转换与运 用 ·与不定式结构的转换（中考核心考点） 一基础结构转换（必掌握）： *口It is supposed to+动词原形→主语+is supposed to+动词原形 *例句转换：It is supposed to rain tomorrow.→Rain is supposed to fall tomorrow. *口It is expected to+动词原形→主语+is expected to+动词原形 *例句转换：It is expected to take two hours.→The task is expected to take two hours. 一特殊句型搭配（常考）： *口It is supposed to be+形容词→主语+is supposed to be+形容词 *例句：It is supposed to be easy.→The exam is supposed to be easy *口It is expected to become+名词→主语+is expected to become+名词 *例句：It is expected to become a tradition..→The event is expected to become a tradition. ·与that从句的转换（中考重点难点） 一基础转换规则（必背）： *It is supposed to be.→It is supposed that+完整从句 *例句：It is supposed to be true.→It is supposed that it is true. *口It is expected to happen→It is expected that+主语+will happen *例句：It is expected to rain.→It is expected that it will rain. 一时态对应规则（易错点）： *D一般现在时：It is expected to be→It is expected that it is *口一般将来时：It is expected to become→It is expected that it will become *☐一般过去时：It was supposed to happen→It was supposed that it would happen ·与疑问句的转换（中考常考题型） -一般疑问句转换（核心）： *Is it supposed to+动词原形？→Are we supposed to+动词原形？ *例句：Is it supposed to be finished?→Are we supposed to finish it? *口Is it expected to+动词原形？→Do people expect it to+动词原形？ *例句：Is it expected to succeed?→Do people expect it to succeed? -特殊疑问句转换（重点）： *☐When is it supposed to happen？→When are we supposed to do it? *☐How long is it expected to last？→How long do they expect it to last? ·与否定句的转换（中考必考） 一否定形式转换（基础）： *It is not supposed to happen-We are not supposed to let it happen *例句：It is not supposed to be moved.→Ve are not supposed to move it. *It is not expected to change-People don't expect it to change *例句：It is not expected to stop.→People don't expect it to stop. -否定意义表达（拓展）： *It is supposed to never happen-We are never supposed to do it *It is expected to hardly occur-They hardly expect it to occur ·被动语态转换（中考难点） -主动被动转换（重点掌握）： *It is supposed to be donePeople suppose it should be done *例句：It is supposed to be finished by Friday.→People suppose it should be finished by Friday.. *It is expected to be completed-They expect it to be completed *例句：It is expected to be built soon..→They expect it to be built soon. 一时态对应转换（易错点）： *☐现在时：It is expected to be made→They expect it to be made *☐过去时：It was supposed to be done→They supposed it should be done *口将来时：It will be expected to be finished一→They will expect it to be finished ·实际运用句型（中考高频） 一天气预报句型（常考）： *It is supposed to get colder tomorrow. *It is expected to be sunny this weekend. 一时间预计句型（重点）： *It is supposed to take about an hour. *It is expected to last until evening. 一计划安排句型（实用）： *It is supposed to start at 8:00. *It is expected to end before dark. 初三1英语|人教版 ENGLISH-初三全一册资料（人教版） 考法一：be supposed to与be expected to词义辨析 ·核心：根据语境判断是强调”按规定习惯应做某事”还是”外界期望预计某事”，选择正确搭配 ·真题1（单项选择）： -You_arrive at the airport two hours before the flight takes off.It's the rule of the airline. A.are supposed to B.are expected to C.supposed to D.expect to -答案：A解析：由"it's the rule'”(这是航空公司的规定)可知强调按规定应做某事，用be supposed to; 主语为you,be动词用are,故选A。 ·真题2（语法填空）： The new movie_(expect)to win several awards because many critics have praised it highly. -答案：is expected解析：由"many critics have praised it'”(许多评论家高度赞扬)可知强调外界期望， 用be expected to;主语为单数，be动词用is,故填is expected。, 考法二：it作形式主语与be supposed to/be expected to的句型转换 ·核心：理解it作形式主语时与be supposed to/be expected to搭配的基本结构，并能进行主动与被动、 不定式与that从句的转换 ·真题1（句型转换）： -It is expected that the meeting will start at9:Oo.(改为简单句) -答案：The meeting is expected to start at9:O0解析：原句为it作形式主语，that从句作真正主语的 结构，根据知识点三“与不定式结构的转换”规则，可转换为“主语+is expected to+动词原形”结 构，即将真正主语“the meeting will start at9:O0”中的主语“the meeting”作为新主语，谓语动词用 “is expected to start”。 ·真题2（单项选择）： -It is supposed __sunny tomorrow. A.to be B.be C.being D.was 一答案：A解析：根据知识点一“it作形式主语”的基本结构“t+be supposed to+动词原形+真正 主语”，此处应用“tobe”,构成“It is supposed to be sunny tomorrow”,真正主语为“to be sunny tomorrow"。 考法三：it作形式主语与be supposed to/be expected to的综合运用 ·核心：识别t作形式主语的结构，掌握与不定式从句的转换，并根据时态和语态准确运用 ·真题1（单项选择）： --is expected to be a heavy rain tonight.You'd better take an umbrella. A.That B.It C.There D.What 一答案：B解析：此处it作形式主语，代替真正主语"to be a heavy rain”,构成”'It is expected to be.”的 固定结构，表示”预计今晚会下大雨”。 ·真题2（句型转换）： -it is supposed to take three hours to finish the project.(改为同义句) The project_take three hours. -答案：is supposed to解析：原句中it为形式主语，真正主语是"to take three hours”;转换后"the project” 作主语，保持be supposed to'”结构不变，时态保持一致。 初三|英语引人教版 ENGLISH-初三全一册资料（人教版） 真题演练 演练一：单项选择（共10题） 1.Students _finish their homework before class according to the school rules A.are supposed to B.are expected to C.supposed to D.expect to 2.The train_arrive at 10:30 because of the heavy snow A.is supposed to B.is expected to C.supposed to D.expects to 3.It is__sunny this weekend according to the weather forecast A.supposed to be B.expected to be C.supposed be D.expected be 4.You__smoke in the library.It's against the regulations A.aren't supposed to B.aren't expected to C.don't suppose to D.don't expect to 5._is supposed to rain tomorrow so we need to take umbrellas A.This B.That C.It D.There 6.The new bridge_be completed by the end of next year A.is supposed to B.is expected to C.supposed to D.expects to 7.It was_a holiday yesterday but we still had to go to school A.supposed to be B.expected to be C.supposed be D.expected be 8._is expected that the concert will attract over 5000 people A.This B.That C.It D.There 9.You__arrive on time for the meeting tomorrow morning A.are supposed to B.are expected to C.supposed to D.expect to 10.The exam_be difficult so we should study hard A.is supposed to B.is expected to C.supposed to D.expects to 演练二：填空（共10题） 1.You_(suppose)to wear uniforms at school 2.The meeting(expect)to last about two hours 3.It is supposed_(rain)tomorrow afternoon 4.She_(not suppose)to park here 5.The project_(expect)to be finished next month 6.It was supposed-(be)a sunny day yesterday 7.They_(expect)to win the game this evening 8.It is expected _(take)three hours to get there 9.We_(suppose)to hand in our papers before Friday