【弯道超车】Unit 7 核心语法之动词不定式作主语-2025年人教新目标版九年级全册英语精讲精练 (含答案解析)

/ 让学习更有效 新课备课备考 | 英语学科 / 让学习更有效 新课备课备考 | 英语学科 2025年人教新目标版九年级英语上册精讲精练 Unit 7 Teenagers should be allowed to choose their own clothes 核心语法：动词不定式作主语 一、核心概念 动词不定式作主语 时，表示具体的、一次性的动作，通常用来说明某个行为或状态。 结构：To + 动词原形（+ 谓语） 二、基本结构 句式 结构 例句 一般形式 To do + be + 表语 To learn English is important. 否定形式 Not to do + be + 表语 Not to go is not an option. 疑问形式 Is it + 形容词 + to do Is it easy to learn English 三、常用句型 To do is to do（ doing is doing） To see is to believe.（眼见为实。） It is + 形容词 + to do（常用形式主语） It is important to learn English.（学英语很重要。） It takes + 时间 + to do It takes 30 minutes to walk to school.（步行到学校需要30分钟。） 四、动词不定式作主语的用法 1、表示具体行为 To help others is our duty.（帮助他人是我们的责任。） 2、表示目的或目标 To win the game is our goal.（赢得比赛是我们的目标。） 3、表示建议或忠告 To get up early is good for health.（早起对健康有益。） 五、it作形式主语 为了避免句子头重脚轻，常用it作形式主语，将真正的主语（不定式）放在句末。 原句 转换后 To learn English is important. It is important to learn English. To get up early is good. It is good to get up early. 六、易错点分析 1、忘记使用不定式符号to Learn English is important.（错误） To learn English is important.（正确） 2、形式主语it使用错误 To learn English is important it.（错误） It is important to learn English.（正确） 3、谓语动词错误 To learn English are important.（错误） To learn English is important.（正确） 七、记忆口诀 “不定式，作主语，to do 形式要牢记。 表示具体某次动，谓语用单数要切记。 头重脚轻怎么办？it形式主语来替代。 多练多用多体会，不定式主语不再难。” 1．It’s not easy _____ us _____ others because we all have different lifestyles and ideas. A．for; to understand B．of; to understand C．for; understand D．of; understanding 2．It is very important for us to _____ and work hard. A．keep fit B．keep fat C．keeping fit D．keeps fat 3．It isn’t easy for us _____ English well. A．learn B．learns C．to learn D．learning 4．—It’s really exciting _____ snowball fights on snowy days. —Sure. Playing with snow often makes me _____ excited. A．to have; to feel B．have; feel C．to have; feel D．having; to feel 5．It's necessary for you _____ exercise every day. A．taking B．to take C．take D．takes 6．It takes him 3 hours _____ the book. A．read B．to read C．reading D．reads 7．It is polite _____ a gift when you visit somebody for the first time. A．take B．taking C．to take D．gets 8．It’s time to _____ the animals. A．save B．saves C．saving D．saved 9．—Let me help you carry the box, Granny. —Thank you, Li Ping. It’s very nice you me. A．of; to help B．for; to help C．of; helping D．for; helping 10．It’s time _____ lunch. Let’s go to the dining hall. A．have B．having C．for have D．to have 11．It was hard for me _____ the teacher when she talked to the class. A．understand B．understood C．to u ... ...