It 相关特殊句式如 It is adj that 从句等-2025-2026学年高中英语选修二语法知识点全解（北师大版）

高中选修2北师大版 【语法专版】 U6知识点全解 语法专版 【专题】t相关特殊句式 语法专项突破 考频分析 北师大版选修2-U6中，t相关特殊句式是重点语法模块，考频占句法总量的15%左右，贯穿试卷 核心题型：单项选择2-3题、语法填空2-3题、书面表达核心考察，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，It作形式主语/宾语的句式转换及从句连接词选择往往是解题关键。 考查内容 。基本句型结构：Itis+adj.+hat从句、It takes sb.some time to do sth.、Itis+被强调部分+that/who.等 句式的构成及连接词选用： 。句法功能辨析：t作形式主语（代替不定式、动名词或从句）与形式宾语（代替宾语从句）的用法 区别： ·语境应用与转换：结合具体语境选择合适句式，以及与其他句型（如主动变被动涉及t的句式）的 转换。 知识点一：t相关特殊句式 1.Itis+adj.+that从句(it作形式主语，that从句为真正主语) l.常见形容词：important(重要的)、necessary(必要的)、clear(清楚的)、strange(奇怪的) 2.例句： ·It is important that we study hard..(that从句“we study hard”是真正主语，it为形式主语) ●It is clear that he will win the game..(that从句“he will win the game”是真正主语) 2.Itis+n.+that从句(it作形式主语，hat从句为真正主语) 1.常见名词：a pity(遗憾)、a fact(事实)、an honor(荣幸)、a wonder(奇迹) 2.例句： 。It is a pity that she missed the party..(that从句“she missed the party”是真正主语) 1 高中选修2北师大版 【语法专版】 U6知识点全解 。It is a fact that the earth goes around the sun.(that从句“the earth goes around the sun”是真正主语) 3.It takes sb.some time to do sth.(it作形式主语，不定式to do sth.为真正主 语) 1.基本结构：It takes+人+时间+to do sth.(表示“做某事花费某人多长时间”) 2.例句： ·It takes me30 minutes to go to school every day..(不定式“to go to school'”是真正主语) 。It took them two hours to finish the work.(不定式“to finish the work”是真正主语) 4.Itis+过去分词+hat从句(it作形式主语，常用于被动结构) l.常见过去分词：said(据说)、reported(据报道)、believed(人们相信)、known(众所周知) 2.例句： ·It is said that he has gone abroad.(that从句“he has gone abroad”是真正主语，意为“据说他出国 了”) 。It is reported that the accident happened last night..(that从句“the accident happened last night”是 真正主语，意为“据报道事故发生在昨晚”) 知识点二：t相关特殊句式 1.Itis+adj.+that从句(it作形式主语，真正主语是that从句) 1.常用形容词：important（重要的)、necessary(必要的)、clear(清楚的)、strange（奇怪的)、possible (可能的) 2.结构：Itis+adj.+that+主语+谓语+其他成分 3.例句： ·It is important that we study hard..(it代替that we study hard,“我们努力学习是重要的”) ·It is necessary that she finish the work today.(it代替that she finish the work today,“她今天完成工 作是必要的”；部分形容词后的从句用虚拟语气，谓语用“should+动词原形”，should可省略， 此处finish前省略should) 2.Itis+adj.+for sb.+to do sth.(it作形式主语，真正主语是to do sth.;adj: 描述事物特征) l.常用形容词：easy(容易的)、difficult(困难的)、hard(艰难的)、important(重要的)、possible(可 能的) 2.结构：Itis+adj.+for sb.+to do sth.(sb.是to do sth.的逻辑主语) 2 高中选修2北师大版 【语法专版】 U6知识点全解 3.例句： ●It is easy for me to solve this problem.(it代替to solve this problem,“对我来说解决这个间题很容 易”) 。It is important for students to learn English well.(it代替to learn English well,“对学生来说学好英 语很重要”) 3.Itis+adj.+ofsb.+to do sth.(it作形式主语，真正主语是to do sth.;adj 描述人的品质) 1.常用形容词：kind(善良的)、nice(友好的)、clever(聪明的)、foolish(愚蠢的)、polite(礼貌的) 2.结构：Itis+adj.+ofsb.+to do sth.(sb.既是to do sth.的逻辑主语，也是adj.修饰的对象) 3.例句： ·It is kind of you to help me.(it代替to help me,“你帮助我真是善良”；kind修饰you) ●It is foolish of him to make such a mistake.(it代替to make such a mistake,“他犯这样的错误真是 愚蠢”；foolish修饰him) 4.It takes sb.+时间+to do sth,(（it作形式主语，真正主语是to do sth.;表示 “做某事花费某人多长时间”) 1.结构：It takes sb.+时间（如hours,.minutes,days)+to do sth.(take意为“花费”，过去式为took) 2.例句： ·It takes me two hours to finish my homework every day..(“我每天花两小时完成作业”) ●It took her three days to read this novel last week.(“上周她花了三天读这本小说”；根据last week 用一般过去时，take过去式为took) 5.Itis+被强调部分+hat/who+其他成分（强调句型，强调句子的主语、宾 语、状语等) 1.强调对象及连接词：强调人时，连接词可用that或who;强调物或其他成分时，连接词用that 2.结构：Itis+被强调部分+that/who+句子剩余部分（去掉Itis..that/who,句子仍完整） 3.例句： 。It is Tom who/that often helps me with my English.(强调主语Tom,“是汤姆经常帮我学英语”) ●It was in the park that I met her yesterday.(强调地点状语in the park,“我昨天是在公园遇见她的”) ·It is this book that I want to buy.(强调宾语this book,“我想买的就是这本书”) 知识点三：t相关特殊句式 1.Itis+adj.+hat从句（中考核心) 高中选修2北师大版 【语法专版】 U6知识点全解 1.基础搭配拓展： 。It is important that..(…是重要的)一→例句：It is important that we learn from mistakes. 。It is necessary that..(…是必要的)→例句：It is necessary that we finish the work on time 。It is clear that..(…是明显的)→例句：It is clear that he is good at math. ●It is possible that.(…是可能的)→例句：It is possible that they will arrive tomorrow. 。It is difficult that..(…是困难的)一→例句：It is difficult that we solve the problem alone. 2.It takes sb.+time+to do sth.(中考必背) 1.用法说明：表示“做某事花费某人多少时间”，t作形式主语，真正主语是后面的不定式。 2.基础搭配拓展： ●It takes me an hour to finish homework.(完成作业花费我一小时。) ·It took him two days to read the book.(读这本书花了他两天时间。) ·It will take us three hours to get there.(到那里将花费我们三小时。) 3.Itis+n.+that从句（中考拓展） 1.基础搭配拓展： 。It is a fact that..(…是事实)→例句：It is a fact that the earth goes around the sun, ●It is a pity that..(…真遗憾)一例句：It is a pity that she can't join us. 。It is a wonder that..(…是奇迹)→例句：It is a wonder that he passed the exam. 考法精析 考法一：It作形式主语的that从句结构辨析 核心：根据语境识别Itis+adj.n./过去分词+that从句结构，判断真正主语并理解句意 真题1（语法填空）： It is reported that the new bridge (build)next year. 答案：will be built 解析：本句为Itis+过去分词(reported)+that从句结构，it为形式主语，that从句“the new bridge..next year”为真正主语；由时间标志词“next year”可知从句动作发生在将来，且bridge与 build为被动关系，用一般将来时的被动语态will be built。 真题2（单项选择）： is a pity that you missed the important meeting yesterday. A.What B.This C.That D.It 4 高中选修2北师大版 【语法专版】 U6知识点全解 答案：D 解析：本句为Itis+n.(a pity)+that从句结构，it作形式主语，that从句“you missed the important mecting yesterday”为真正主语，需用it作形式主语，其他选项无此用法。 考法二：t作形式主语与非谓语动词结合 核心：区分It作形式主语时真正主语为hat从句或非谓语动词（不定式/动名词）的用法，结合非 谓语动词功能及形式选择正确结构 真题1（语法填空)： It is necessary_ (learn)basic skills before starting the project. 答案：to learn 解析：根据知识点一“Itis+adj.+that从句”和知识点二“动词不定式作主语常用it作形式主语”， 句中形容词necessary描述事物特征，真正主语需用不定式todo结构，故填to learn。 真题2（单项选择)： It is said that(read)aloud in the morning helps improve pronunciation A.read B.reading C.to read D.reads 答案：B 解析：句中北为形式主语，真正主语需用非谓语动词：根据知识点二“动名词作主语表抽象概念”，“晨 读”为经常性抽象动作，应用动名词reading,故选B。 考法三：t作形式主语的句式辨析与强调句综合运用 核心：区分Itis+adj.+for/ofsb.to do sth.结构，识别强调句型并结合形式主语结构进行综合判断 真题1（单项选择）： It is kind you to help me carry the heavy box.And it is important us to learn teamwork. A.for;of B.of;for C.for;for D.of,of 答案：B 解析：第一空形容词kind描述人的品质，用ofsb.结构；第二空形容词important描述事物特征，用 for sb.结构，故选B。 真题2（语法填空）： It is reported that a new park (build)in our citynext year.And it is this park will improve our living environment. 答案：will be built,that 解析：第一句为Itis+过去分词+that从句结构，从句主语a new park与build是被动关系，由 next year可知用一般将来时被动语态will be built;第二句去掉Itis.that后句子完整(this park will improve our living environment),为强调句型，强调主语this park,故填that。 5 高中选修2北师大版 【语法专版】U6知识点全解 解题小妙招 形式主语妙招 形式主语用t,真正主语放后面： that从句表事实，不定式表具体行为： 动名词表抽象概念，区分用法看语境： for sb to do是结构，形容词后常出现； by后要跟动名词，方式方法记心间： 被动语态看主语，be done结构要牢记。 真题演练 演练一：单项选择试题（共10题） 1.It is necessarywe should take action to reduce pollution immediately. A.what B.that C.which D.how 2. _is a wonder that the ancient temple has stood for over 1,000 years. A.This B.That C.It D.What 3.It took them three hoursthe difficult math problem yesterday. A.solving B.solved C.to solve D.solve 4.It is reported that the number of wild tigers increasing in recent years. A.is B.are C.was D.were 5.It is kindyou to donate so much money to the poor children. A.for B.of C.with D.about 6.seems that our team will win the competition this time. A.That B.This C.It D.What 7.It was in the labmy father worked that I met the famous scientist. A.which B.where C.that D.who 8.The teacher told us any noise in the library. A.not make B.not to make C.don't make D.not making 9.It is important for studentsgood reading habits from an early age. A.develop B.developing C.to develop D.developed 10. by many people,the new policy has greatly improved people's lives. A.Supported B.Supporting C.Support D.To support 演练二：填空试题（共10题，每空一词） 6 高中选修2北师大版 【语法专版】 U6知识点全解 1.It is said that he (leave)for Beijing tomorrow morning. 2.It takes me two hours (finish)my homework every day. 3.It is a pity that she (not attend)the party last night. 4.It is necessary _we should respect our parents and teachers. 5. is reported that the accident caused three injuries. 6.It was Tom helped me carry the heavy box yesterday. 7.She got up early(catch)the first train to Shanghai. 8.It is important for us (protect)wild animals. 9.The book (write)by Lu Xun is still popular today. 10.It seems that she (know)the truth already 演练三：语法填空试题（共10空） Nowadays,more and more people are paying attention to environmental protection.It is reported that a new nature reserve (build)in our city next year,which will cover an area of 500 square kilometers. The reserve aims to protect endangered species,such as pandas and red-crowned cranes. It is necessary for us (take)action to reduce waste.For example,we can use reusable bags instead of plastic ones,and avoid (buy)products with excessive packaging.It is also important we educate children about the importance of environmental protection from a young age. It takes time and effort (change)people's habits,but everyone's contribution matters.It is believed that we work together,we (create)a greener and healthier world for future generations. Last week,I participated in a volunteer activity (organize)by our school.We planted over 200 trees in the park.It was tiring,but I felt happy (see)the trees standing in arow.It is clear that small actions (make)a big difference. 参考答案 演练-：1.B2.C3.C4.A5.B6.C7.C8B9.C10.A 1.will leave 2.to finish 3.didn't attend 4.that 5.It 6.who/that 7.to catch 8.to protect 9.written 10.has known 1.will be built 2.to take 3.buying 4.that 5.if 6.will create 7.organized 8.to see 9.will make 10.(无需额外词，原句完整) 解析说明（部分重点题）： -演练一第7题：强调句型，强调主语“Tom”,用“that/who”,故选C。 演练二第6题：强调句型强调主语“Tom”,填“wo/hat”。 高中选修2北师大版 【语法专版】 U6知识点全解 演练三第1题：主语从句中“reserve'”与“build'”为被动关系，且“next year”表将来，用“will be built'”。 8