2026年英语中考语法形式主语句式讲解&专项练习

2026年英语中考语法形式主语句式精讲&专项练习 一、语法精讲：形式主语句式（It作形式主语） 当句子的真正主语是不定式短语、动名词短语或主语从句时，为避免头重脚轻，常将“It”放在句首作形式主语，把真正主语后置。 常见考点句式总览： 考点类别 核心句型 示例 不定式作真主语 It is + adj. + (for/of sb.) + to do It's easy for him to swim. It takes sb. + 时间 + to do It took me an hour to finish it. It is + n. + to do It's a pity to miss the show. 动名词作真主语 It is no use/good doing It's no use crying over spilt milk. 主语从句作真主语 It is + adj. + that... It's important that we are honest. It is + n. + that... It's a fact that the earth moves. It is + done + that... It is said that he is a genius. It seems/appears that... It seems that no one knows the truth. 易错辨析：for与of 形容词修饰事物特性（难易、重要）时用 for。 It is important for us to protect nature. 形容词修饰人的品格（善良、聪明、愚蠢）时用 of。 It is kind of you to help me. 可记忆为：若句子可改写为“You are + adj.”则用of。 You are kind. → It is kind of you... ✔ 专项练习（考点分层） 专项练习一：It作形式主语代替不定式 考点： 掌握“It is + adj. + (for/of sb.) + to do”及“It takes sb. some time + to do”句式。能正确区分介词for/of，并将不定式主语转换为形式主语句。 一. 单项选择 ( ) 1. It is very dangerous ______ children to play with fire. A. of B. for C. to D. with ( ) 2. It’s really nice ______ you to say so. A. for B. of C. to D. about ( ) 3. ______ took us nearly two hours to clean the classroom. A. This B. That C. It D. We ( ) 4. Is ______ possible to finish the work in such a short time? A. that B. he C. it D. this ( ) 5. It is a good habit ______ breakfast every morning. A. had B. have C. to have D. having 二. 用 for 或 of 填空 6. It was careless ______ the boy to lose his wallet. 7. It’s difficult ______ the villagers to cross the river without a bridge. 8. It is brave ______ the firefighter to enter the burning house. 9. It’s necessary ______ students to review lessons in time. 三. 句型转换 10. To get there by bike is impossible. （用It改写） ________________________________________________. 11. Learning English well in one day is not easy. （改为形式主语句） ________________________________________________. 四. 根据汉语完成句子 12. 保护濒危动物对我们来说很重要。 ______ very important ______ us ______ protect endangered animals. 13. 我花了两天时间才读完那本书。 ______ ______ me two days ______ finish reading that book. 专项练习二：It作形式主语代替动名词 考点： 掌握“It is no use/good doing sth.”固定句型，辨别后接动名词与不定式的区别。 一. 单项选择 ( ) 1. —I’ve made little progress in English. —Don’t worry. It’s no use ______. Just keep trying. A. complain B. to complain C. complaining D. complained ( ) 2. It’s no good ______ around all day. You should find a job. A. sit B. to sit C. sitting D. sat ( ) 3. Is it worthwhile ______ so much money on clothes? A. spend B. to spend C. spending D. spent 二. 用所给词的适当形式填空 4. It's a waste of time ______ (argue) with those who never listen. 5. It's no use ______ (cry) over spilt milk. Just clean it up. 三. 改错 6. It is no use to ask him for help. He is so stubborn. 7.There is no good eating too much junk food. (找出错误并改正) 专项练习三：It作形式主语代替主语从句 考点： 掌握“It is + adj./n. + that从句”、“It is said/believed that...”等句型，注意that不可省略，且正确区分“It’s said that”与“Sb. is said to do”的转换。 一. 单项选择 ( ) 1. It’s a pity ______ you missed such an exciting movie. A. what B. that C. when D. how ( ) 2. ______ is believed that the man has escaped from prison. A. This B. That C. It D. One ( ) 3. It is clear ______ the project will bring great changes to the city. A. when B. if C. that D. whether ( ) 4. It’s not certain ______ she will come to the party or not. A. that B. if C. whether D. weather 二. 同义句转换 5. They say that the new mayor will take office next week. ______ ______ ______ that the new mayor will take office next week. 6. She seems to have known the bad news. ______ ______ ______ she has already known the bad news. 三. 翻译句子 7. 据说这个博物馆已有上百年的历史了。 8. 人们相信，团队合作是成功的关键。 专项练习四：形式主语综合辨析与强调句区分 考点： 综合运用各类形式主语句式；区分形式主语（It + be... + that...） 与强调句型（It is... that/who...）；理解“It seems/appears that...”结构。 方法点拨： 将句子中的“It is/was... that/who...”去掉。若剩余部分仍能构成一个完整句子(调整语序后)，则为强调句型；若剩余部分不成完整句，则为形式主语句式。 例： 强调句：It was Tom that broke the window. → Tom broke the window. (完整) 形式主语句：It is important that we stay united. → That we stay united is important. (原句that从句需移回，不是直接去掉就完整) 一. 单选：判断属于形式主语还是强调句 ( ) 1. It was in the park ______ I lost my phone yesterday. A. where B. that C. when D. what ( ) 2. ______ seems that no one has seen the thief so far. A. This B. It C. That D. One ( ) 3. It is what you do rather than what you say ______ matters. A. that B. which C. it D. this ( ) 4. ______ is a shame that such a talented singer retired so early. A. As B. That C. It D. What 二. 改错 5. It is true that does he live in a small village. 6. It was on Sunday when we held the charity sale. （指出错误并改正） 三. 根据语境填入正确的形式主语句型 7. A: Shall we go out for a walk? B: Well, ______ ______ (似乎) that it’s going to rain. 8. 独自去森林徒步旅行很危险。 (用It开头翻译) 参考答案与解析 专项练习一 1.B （危险是“玩火”这件事的性质，用for） 2. B （nice形容“你”的品格，用of） 3. C （It takes sb. time to do固定句型） 4. C （形式主语it） 5. C （不定式to have作真正主语，It is a good habit to do） 6. of （careless形容男孩粗心） 7. for （difficult形容过河这件事的性质） 8. of （brave形容消防员的品格） 9. for （necessary说明事情的必要性） 10.It is impossible to get there by bike. 11. It is not easy to learn English well in one day. （注意：动名词短语作主语也可改为不定式，中考通常接受“It is not easy to learn...” 原句learning也可转to learn） 12. It is; for; to 13. It took; to 专项练习二 1. C （It’s no use doing 固定搭配） 2. C （It’s no good doing） 3. C （It is worthwhile doing 固定用法，也可接to do，但doing更常见于形式主语后，此处选动名词） 4. arguing （It’s a waste of time doing） 5. crying （It’s no use doing） 6. 将 to ask 改为 asking。 正确：It is no use asking him for help. 7. 将 There 改为 It。 正确：It is no good eating too much junk food. 专项练习三 1. B （It’s a pity that... 固定句式） 2. C （It is believed that... 据说/相信） 3. C （It is clear that...） 4. C （与or not连用，只用whether，if不可） 5. It is said 6. It seems that 7. It’s said that this museum has a history of over one hundred years. 8. It is believed that teamwork is the key to success. 或者就用It is certain that... 专项练习四 1. B （强调地点状语in the park，用that） 2. B （It seems that... 形式主语） 3. A （强调主语从句“what you do... matters”，是It is... that...的强调句式） 4. C （It is a shame that... 形式主语） 5. 将 does he live 改为 he lives。 正确：It is true that he lives in a small village. （that从句用陈述语序） 6. 将 when 改为 that。 正确：It was on Sunday that we held the charity sale. （强调时间状语用that，不是when） 7. It seems 8. It is dangerous to go hiking in the forest alone. 学科网（北京）股份有限公司 $