主语从句-2025-2026学年高中英语选修一语法重难点精讲（重大版）

高中·重庆大学出版社 选择性必修1主语从句专项 【语法专题】主语从句专项突破 高中重庆大学出版社选择性必修1 语法精讲 语法概述：在复合句中充当主语的从句，通常由连接词that、whether,连接代词what、who、which, 连接副词when、where、.why、how引导；当主语从句较长时，常用it作形式主语，而将真正的主 语从句置于句末，使句子结构更平衡，在句中作主语。 重难点讲解 重难点一：主语从句引导词的选择与用法讲解： 引导主语从句的连接词分为三类：1.连接代词(what,who,whom,whose,which),在从句中充当 主语、宾语、定语等成分：2.连接副词(when,where,why,how),在从句中作状语：3.从属连词 (that,whether),只起连接作用，不充当句子成分，that无意义，whether表“是否”。 例句： ●What he said surprised everyone..(what在从句中作宾语) ·Why she left remains a mystery..(why在从句中作原因状语) 。That he will come tomorrow is certain.(that只起连接作用，无实际意义) 。Whether we will go depends on the weather.(whether表“是否”，不充当成分) 真题再现： 1.(2024重庆巴蜀中学期中，重庆大学出版社)_makes the book so popular is its interesting story. A.What B.That C.Who D.Why 答案：A解析：从句中缺少主语，指事物，用wat引导主语从句。 2.(2023重庆八中月考，重庆大学出版社)_we will have a picnic this weekend hasn't been decided yet. A.What B.Whether C.That D.Where 高中·重庆大学出版社 选择性必修1主语从句专项 答案：B解析：句意为“我们这周末是否去野餐还没决定”，表“是否”用whether引导主 语从句，that无意义，不符合语境。 重难点二：形式主语t的用法讲解： 当主语从句较长时，为避免句子头重脚轻，常用t作形式主语，将真正的主语从句置于句末。常 见结构：l.It+be+形容词(important/necessary/clear等)+that从句；2.It+be+名词(a fact/a pity/no wonder等)+that从句；3.It+be+过去分词(said/reported/believed等)+that从句。 例句： ●It is important that we should learn English well.(真正主语是that we should learn English well) ·It is a pity that you didn't attend the meeting.(真正主语是that you didn't attend the meeting) ·It is said that he has gone abroad.(真正主语是that he has gone abroad) 真题再现： l.(2024重庆一中期末，重庆大学出版社)is necessary we should protect the environment. A.It;that B.That;it C.What;that D.It;what 答案：A解析：此处用it作形式主语，真正主语是that引导的从句，构成“It is necessary that.”结构。 2.(2023重庆南开中学月考，重庆大学出版社)It is reporteda new hospital will be built in our city next year. A.that B.what C.whether D.when 答案：A解析：“It is reported that.”为固定结构，it作形式主语，that引导的从句是真正主 语，that无意义，不充当成分。 重难点三：that与whether的区别讲解： that引导主语从句时，无实际意义，不充当句子成分，通常不能省略（尤其在句首时)：whether引 导主语从句时，意为“是否”，不充当句子成分，不能用f替换(f不能引导位于句首的主语从 句)。 例句： ·That he succeeded in the exam made his parents happy..(that无意义，不可省略) ·Whether she will accept the invitation is not known.(whether表“是否”，不能用if替换) 高中·重庆大学出版社 选择性必修1主语从句专项 真题再现： 1.(2024重庆外国语学校期中，重庆大学出版社)the project will be completed on time is still a question. A.That B.Whether C.If D.What 答案：B解析：句意为“这个项目是否能按时完成还是个问题”，表“是否”且位于句首， 用whether,if不能引导句首主语从句。 2.(2023重庆育才中学月考，重庆大学出版社)he will come to the party doesn't matter much. A.If B.Whether C.That D.What 答案：C解析：从句结构完整且句意明确，用ht引导主语从句，无实际意义，不充当成 分。 易错点综合演练 I单项选择（直击重难点） 1.he will arrive on time depends on the traffic A.When B.That C.Whether D.What 2.It is a pity you missed the lecture yesterday. A.what B.that C.whether D.how 3.makes this novel special is its unique writing style. A.Which B.Who C.What D.Why 4.It is reported the new subway line will open next month 高中·重庆大学出版社 选择性必修1主语从句专项 A.that B.if C.when D.what Ⅱ.用所给词的适当形式填空（强化句型结构） 1.(that)we need more practice is obvious to everyone. 2.It is necessary_(we,finish)the project before Friday.(用所给词的适当形式构成主语从句) 3.(whether)she will join us hasn't been decided yet. 4.It(say)that he has won the first prize in the competition. 5.(what)he told us yesterday was quite interesting 血.短文填空（综合运用主语从句） 用适当的引导词填空，使短文完整通顺。 1.we will have a picnic this weekend depends on the weather. 2.is important is that we should prepare well for the exam. 3.It is a fact exercise is good for our health 4.he didn't attend the meeting surprised all of us. 5.It is said our school will hold a sports meeting next month. V.连词成句（聚焦句型结构） 1.it,clear,is,that,he,telling,the,truth,is (. 2.what,she,said,made,us,angry,very ( 3.whether,they,will,come,to,the,party,not,yet,decided,is() 4.it,a,pity,is,that,you,can't,with,us,go (. 5.why,he,late,was,for,class,remains,mystery,a() V.按要求改写句子（巩固主语从句用法） l.He will come to the party.It is certain..(合并为含主语从句的句子) 2.She finished the work on time.It surprised everyone..（合并为含主语从句的句子) 3.It is important that we should learn from each other..(改为不含形式主语的句子) 4 高中·重庆大学出版社 选择性必修1主语从句专项 4.Whether they will go hiking depends on the weather.(改为含形式主语it的句子) 参考答案 I.单项选择：1.C2.B3.C4.A Ⅱ.用所给词的适当形式填空： 1.That 2.that we (should)finish 3.Whether 4.is said 5.What Ⅲ.短文填空： 1.Whether 2.What 3.that 4.That 5.that V.连词成句： 1.It is clear that he is telling the truth 2.What she said made us very angry. 3.Whether they will come to the party is not decided yet 4.It is a pity that you can't go with us. 5.Why he was late for class remains a mystery. V按要求改写句子： 1.That he will come to the party is certain. 2.What surprised everyone was that she finished the work on time. 3.That we should learn from each other is important. 4.It depends on the weather whether they will go hiking.