Unit 5主语从句-2025-2026学年高中英语选修一语法易错点精讲（人教版）

高中人教版 【寒假专版】 选修1语法精讲 寒假专版 主语从句专项训练 寒假语法易错点精讲 学段：高中 教材：人教版年级：选修1 语法认知 主语从句(Subject Clause)=在复合句中充当主语的从句，常由连接词that、whether、who、what、 which、when、where、.why、how等引导，在句中可置于句首或用it作形式主语置于句首而将从句 后置。 易错点讲解 易错点一：连接词hat与what的误用 讲解： that在主语从句中仅起连接作用，无实际意义，不充当句子成分：wht既起连接作用，又在从句 中充当主语、宾语或表语，意为“…的事情/东西”。 例句： -That he will come is certain.(that不充当成分，仅连接从句) -What he said surprised us..(what在从句中作宾语，意为“他说的话”) 真题再现： 1.(2024湖北武汉期中，人教版选修1)_matters most in learning English is enough practice.. A.What B.Why C.That D.Which 答案：A解析：从句中缺少主语，且表示“的事情”，用wht引导主语从句。 2.(2023湖南长沙期末，人教版选修I)_he failed the exam upset his parents. A.What B.That C.Which D.How 答案：B解析：从句结构完整，不缺成分，用ht引导主语从句，仅起连接作用。 易错点二：形式主语t与真实主语的混淆 高中人教版 【寒假专版】 选修1语法精讲 讲解： 当主语从句较长时，常用t作形式主语，将真实主语从句后置，避免句子头重脚轻。常见结构：t +be+形容词/名词/过去分词+that/whether/wh-从句。不可直接将从句置于句首作主语（除非从句 较短)。 例句： -It is important that we learn English well.(it为形式主语，that从句为真实主语) -It is a pity that she didn't attend the meeting.(it为形式主语，that从句为真实主语) 真题再现： 1.(2024山东青岛月考，人教版选修1)一is necessary for us to master a foreign language. A.That B.This C.It D.What 答案：C解析：此处用it作形式主语，真正的主语是后面的动词不定式短语to master a foreign language(人教版教材中常与主语从句结构对比考查)。 2.(2023广东深圳期中，人教版选修1)It is known to all.一the earth moves around the sun. A.that B.what C.whether D.how 答案：A解析：It is known to all that.为固定句型，it为形式主语，hat引导的主语从句为真实 主语，从句结构完整，不缺成分。 易错点三：whether与if的误用 讲解： whether和f均可引导“是否”类主语从句，但位于句首时只能用whether:if不能引导位于句首 的主语从句，也不能与or not直接连用(whether可与or not连用，或分开用)。 例句： -Whether he will come or not is uncertain.(句首用whether,可与or not连用) -It is unclear if/whether he will accept the invitation.(作形式主语后的真实主语时，if和whether均 可) 真题再现： 1.(2024浙江杭州期末，人教版选修I)一_we will go for a picnic tomorrow depends on the weather. A.If B.Whether C.That D.What 答案：B解析：主语从句位于句首，表“是否”，只能用whether引导，f不可用于句首主语从 句。 2.(2023江苏南京月考，人教版选修1)It is still unknown一the meeting will be held next week, A.if B.that C.whether D.what 答案：C解析：主语从句表“是否”，且位于形式主语it之后，whether和if均可，但人教版教 2 高中人教版 【寒假专版】 选修1语法精讲 材更倾向于用whether表正式语气，尤其是在考试中。 易错点四：主语从句的时态与语序错误 讲解： 1.时态：若主句为一般现在时，从句可根据实际情况用任意时态；若主句为一般过去时，从句常 用相应过去时态（客观真理除外）。 2.语序：主语从句必须用陈述语序，即“连接词+主语+谓语+其他”，不可用疑问语序。 例句： -What he is doing now is a secret..(主句现在时，从句现在进行时，陈述语序) ,She asked what I had done yesterday.(主句过去时，从句过去完成时，陈述语序) 真题再现： 1.(2024四川成都期中，人教版选修1)Could you tell me一_the accident happened? A.how did B.how was C.how D.how does (注：本题虽为宾语从句，但主语从句语序规则一致，人教版选修1常结合考查) 答案：C解析：宾语从句（主语从句同理）需用陈述语序，即“连接词+主语+谓语”，how后 直接接主语the accident和谓语happened。 2.(2023河南郑州期末，人教版选修1)It is reported that a new school一in our city next year. A.will build B.will be built C.builds D.is built 答案：B解析：主语从句中，next year表将来，且“学校被建造”为被动语态，用一般将来时的 被动语态will be built。 易错点五：t作形式主语时与其他句型的混淆 讲解： 需区分it作形式主语的主语从句与强调句(It is/was+被强调部分+hat+其他)。主语从句中it无 实际意义，去掉it和be动词后，剩余部分可构成完整句子；强调句中that不可省略，去掉It is/was 和hat后，句子仍完整。 例句： -It is clear that he is lying.(主语从句：That he is lying is clear..) -It ishe that is lying.(强调句：He is lying) 真题再现： 1.(2024陕西西安期中，人教版选修1)It was一he said at the meeting that surprised us. A.what B.that C.how D.where 答案：A解析：此处为强调句，被强调部分是主语从句what he said(what在从句中作宾语)， 3 高中人教版 【寒假专版】 选修1语法精讲 去掉It was和that后，句子为“What he said at the meeting surprised us”,结构完整。 2.(2023江西南昌期末，人教版选修1)It is a fact_English is widely used in the world. A.what B.which C.that D.when 答案：C解析：it为形式主语，真正主语是that引导的从句，从句结构完整，不缺成分，用that 连接，符合人教版选修1主语从句基本用法。 易错点综合演练 综合演练 I单项选择（直击易错点) l._he will join the club depends on his parents'permission..（易错点三) A.If B.Whether C.That D.What 2.It is necessary-we should finish the project on time.(易错点二) A.that B.what C.if D.how 3.-surprised us most was his sudden decision to resign.(易错点一) A.That B.What C.Which D.How 4.Could you explain._the meeting will be postponed till next week?(易错点四) A.why will B.why C.why is D.why did Ⅱ用所给词的适当形式填空（强化易错点区分) l.一he)failed in the exam made his teacher angry.（易错点一) 2.It is reported that a new hospital._(build)here next year..(易错点四) 3._(whether)she will come or not hasn't been decided yet..(易错点三) Ⅲ.短文填空（综合运用四大易错点） 用适当的连接词填空，使短文完整通顺。（人教版选修1教材课文改编) Many students wonder about the secret of learning English well.Actually,1.-matters most is persis- tence.Some students think 2.is difficult to remember new words.However,3.-they can make use of mnemonics,they will find it easier.Teachers often say 4.-reading English newspapers every day helps improve reading skills.It is also important to know 5.you should ask for help when you meet difficulties V.连词成句（聚焦易错句式） l.that,important,.is,English,learn,well,it()（易错点二) 4 高中人教版 【寒假专版】 选修1语法精讲 2.what,said,just now,he,surprised,us()（易错点一) 3.whether,tomorrow,will,rain,it,is,unknown()(易错点三) 4.how,we,solve,problem,the,can,is,key,the)(易错点四) 参考答案 I单项选择 1B2.A3.B4.B Ⅱ.用所给词的适当形式填空 1.That 2.will be built 3.Whether III短文填空 1.what 2.it 3.if/whether 4.that 5.when/how V.连词成句 1.It is important that we learn English well. 2.What he said just now surprised us 3.It is unknown whether it will rain tomorrow. 4.How we can solve the problem is the key. 5