Unit 6 Sunshine for all. It is +形容词+for...+动词不定式 (语法讲解+分层精练）--2025-2026学年译林版英语八年级下册

Unit 6 Sunshine for all. （It is +形容词+for...+动词不定式） (语法讲解+分层精练） 目 录 一、语法讲解 1 （一）基本结构 1 （二）核心用法 1 （三）常用形容词分类 1 二、中考题型练习题（30道） 2 （一）单项选择（15题） 2 （二）用所给词的适当形式填空（10题） 3 （三）句型转换（5题） 3 一、语法讲解 （一）基本结构 · 构成：It is + 形容词 + for sb. + to do sth. · 例句：It is important for us to protect the environment.（对我们来说，保护环境很重要。） （二）核心用法 · it 作形式主语：句首的 it 没有实际意义，只是形式上的主语，真正的主语是后面的动词不定式短语 to do sth.。 · 真正主语是后面的动词不定式：句子想要表达的核心内容是“对某人来说，做某事是怎样的”。 · 功能：用于表达对某件事的看法、评价或感受，强调事情本身的性质。 · 与 of 句型的区别：本句型中的形容词描述事情的性质（如 important, easy, dangerous），不可转换为 “Sb. is + 形容词 + to do sth.”。 （三）常用形容词分类 用于这个句型的形容词通常用来描述事情的性质、难度、重要性、安全性等，常见的有： 类别 常用形容词 重要性/必要性 important, necessary, essential, vital 难易程度 easy, hard, difficult, simple, tough, complicated 可能性/安全性 possible, impossible, dangerous, safe, useful, useless, helpful 好坏/对错 good, bad, right, wrong, normal, common, unusual 其他描述 interesting, boring, exciting, meaningful, convenient, comfortable, expensive 二、中考题型练习题（30道） （一）单项选择（15题） 1. It is important ______ us to learn English well. A. for B. of C. to D. with 2. It is difficult ______ him to finish the work in two hours. A. for B. of C. to D. with 3. It is necessary ______ students to do morning exercises every day. A. for B. of C. to D. with 4. It is possible ______ robots to do many things in the future. A. for B. of C. to D. with 5. It is dangerous ______ children to play with fire. A. for B. of C. to D. with 6. It is easy ______ you to solve this problem because you are good at math. A. for B. of C. to D. with 7. It is useful ______ us to know some first aid knowledge. A. for B. of C. to D. with 8. It is meaningless ______ us to argue about such a small thing. A. for B. of C. to D. with 9. It is impossible ______ them to arrive before dark. A. for B. of C. to D. with 10. It is interesting ______ children to watch cartoons. A. for B. of C. to D. with 11. It is hard ______ old people to learn new technology. A. for B. of C. to D. with 12. It is convenient ______ us to shop online now. A. for B. of C. to D. with 13. It is common ______ people to send messages on WeChat. A. for B. of C. to D. with 14. It is not right ______ you to copy others' homework. A. for B. of C. to D. with 15. It is meaningful ______ volunteers to help the disabled. A. for B. of C. to D. with （二）用所给词的适当形式填空（10题） 1. It is important for us _____________ (learn) a second language. 2. It is difficult for him _____________ (work) out the maths problem. 3. Is it necessary for us _____________ (finish) the project today? 4. It is dangerous for children _____________ (play) in the street. 5. It is easy for her _____________ (sing) this song because she practices a lot. 6. It is impossible for them _____________ (get) there on time in such heavy traffic. 7. It is useful for students _____________ (take) notes in class. 8. It is interesting for me _____________ (watch) this movie. 9. It is not easy for old people _____________ (use) smartphones. 10. It is meaningful for us _____________ (join) the charity activity. （三）句型转换（5题） 1. To learn English well is important for us. (改为同义句) ______ ______ important for us ______ ______ English well. 2. For him to finish the work alone is difficult. (改为同义句) ______ ______ difficult for him ______ ______ the work alone. 3. It is easy for them to find the place. (改为否定句) ______ ______ easy for them ______ ______ the place. 4. It is dangerous for kids to swim in the river. (改为一般疑问句) ______ ______ dangerous for kids ______ ______ in the river? 5. Is it necessary for us to wait for him? (改为陈述句) ______ ______ necessary for us ______ ______ for him. 1 学科网（北京）股份有限公司 $ Unit 6 Sunshine for all. （It is +形容词+for...+动词不定式） (语法讲解+分层精练） 目 录 一、语法讲解 1 （一）基本结构 1 （二）核心用法 1 （三）常用形容词分类 1 二、中考题型练习题（30道） 2 （一）单项选择（15题） 2 （二）用所给词的适当形式填空（10题） 3 （三）句型转换（5题） 3 一、语法讲解 （一）基本结构 · 构成：It is + 形容词 + for sb. + to do sth. · 例句：It is important for us to protect the environment.（对我们来说，保护环境很重要。） （二）核心用法 · it 作形式主语：句首的 it 没有实际意义，只是形式上的主语，真正的主语是后面的动词不定式短语 to do sth.。 · 真正主语是后面的动词不定式：句子想要表达的核心内容是“对某人来说，做某事是怎样的”。 · 功能：用于表达对某件事的看法、评价或感受，强调事情本身的性质。 · 与 of 句型的区别：本句型中的形容词描述事情的性质（如 important, easy, dangerous），不可转换为 “Sb. is + 形容词 + to do sth.”。 （三）常用形容词分类 用于这个句型的形容词通常用来描述事情的性质、难度、重要性、安全性等，常见的有： 类别 常用形容词 重要性/必要性 important, necessary, essential, vital 难易程度 easy, hard, difficult, simple, tough, complicated 可能性/安全性 possible, impossible, dangerous, safe, useful, useless, helpful 好坏/对错 good, bad, right, wrong, normal, common, unusual 其他描述 interesting, boring, exciting, meaningful, convenient, comfortable, expensive 二、中考题型练习题（30道） （一）单项选择（15题） 1. It is important ______ us to learn English well. A. for B. of C. to D. with 2. It is difficult ______ him to finish the work in two hours. A. for B. of C. to D. with 3. It is necessary ______ students to do morning exercises every day. A. for B. of C. to D. with 4. It is possible ______ robots to do many things in the future. A. for B. of C. to D. with 5. It is dangerous ______ children to play with fire. A. for B. of C. to D. with 6. It is easy ______ you to solve this problem because you are good at math. A. for B. of C. to D. with 7. It is useful ______ us to know some first aid knowledge. A. for B. of C. to D. with 8. It is meaningless ______ us to argue about such a small thing. A. for B. of C. to D. with 9. It is impossible ______ them to arrive before dark. A. for B. of C. to D. with 10. It is interesting ______ children to watch cartoons. A. for B. of C. to D. with 11. It is hard ______ old people to learn new technology. A. for B. of C. to D. with 12. It is convenient ______ us to shop online now. A. for B. of C. to D. with 13. It is common ______ people to send messages on WeChat. A. for B. of C. to D. with 14. It is not right ______ you to copy others' homework. A. for B. of C. to D. with 15. It is meaningful ______ volunteers to help the disabled. A. for B. of C. to D. with （二）用所给词的适当形式填空（10题） 1. It is important for us _____________ (learn) a second language. 2. It is difficult for him _____________ (work) out the maths problem. 3. Is it necessary for us _____________ (finish) the project today? 4. It is dangerous for children _____________ (play) in the street. 5. It is easy for her _____________ (sing) this song because she practices a lot. 6. It is impossible for them _____________ (get) there on time in such heavy traffic. 7. It is useful for students _____________ (take) notes in class. 8. It is interesting for me _____________ (watch) this movie. 9. It is not easy for old people _____________ (use) smartphones. 10. It is meaningful for us _____________ (join) the charity activity. （三）句型转换（5题） 1. To learn English well is important for us. (改为同义句) ______ ______ important for us ______ ______ English well. 2. For him to finish the work alone is difficult. (改为同义句) ______ ______ difficult for him ______ ______ the work alone. 3. It is easy for them to find the place. (改为否定句) ______ ______ easy for them ______ ______ the place. 4. It is dangerous for kids to swim in the river. (改为一般疑问句) ______ ______ dangerous for kids ______ ______ in the river? 5. Is it necessary for us to wait for him? (改为陈述句) ______ ______ necessary for us ______ ______ for him. 参考答案与解析 （一）单项选择 1. A（important 描述事情的重要性，用 for。本句意为“对我们来说学好英语很重要。”） 2. A（difficult 描述事情的难度，用 for。） 3. A（necessary 描述必要性，用 for。） 4. A（possible 描述可能性，用 for。） 5. A（dangerous 描述危险性，用 for。） 6. A（easy 描述容易程度，用 for。后面说“你擅长数学”，所以“对你来说解决这个问题很容易”，用 for。） 7. A（useful 描述有用性，用 for。） 8. A（meaningless 意为“无意义的”，描述事情的性质，用 for。） 9. A（impossible 描述不可能性，用 for。） 10. A（interesting 描述有趣性，用 for。） 11. A（hard 描述困难，用 for。） 12. A（convenient 描述便利性，用 for。） 13. A（common 描述普遍性，用 for。） 14. A（right/wrong 描述事情的对错，用 for。注意：此句中的 wrong 描述“抄袭作业”这件事是不对的，不是描述人的品质，因此用 for，可对比 of 句型：It is wrong of you to copy... 强调“你这样做是不对的”，两种说法有时可互换，但侧重点不同。本题强调事情本身，用 for 更合适。） 15. A（meaningful 描述意义，用 for。） （二）用所给词的适当形式填空 1. to learn（句型 It is + adj. + for sb. + to do sth.，不定式符号 to 不能省略。） 2. to work（同上） 3. to finish（疑问句结构，但动词仍用不定式 to finish。） 4. to play（dangerous for sb. to do sth.） 5. to sing（easy for sb. to do sth.） 6. to get（impossible for sb. to do sth.） 7. to take（useful for sb. to do sth.） 8. to watch（interesting for sb. to do sth.） 9. to use（not easy for sb. to do sth.） 10. to join（meaningful for sb. to do sth.） （三）句型转换 1. It is; to learn（原句不定式短语作主语，改为 it 形式主语：It is important for us to learn English well.） 2. It is; to finish（原句 for him to finish... 作主语，改为 it 形式主语：It is difficult for him to finish the work alone.） 3. It is not; to find（否定句直接在 is 后加 not：It is not easy for them to find the place.） 4. Is it; to swim（一般疑问句将 is 提到句首：Is it dangerous for kids to swim in the river?） 5. It is; to wait（疑问句改为陈述句，去掉疑问语序：It is necessary for us to wait for him.） 1 学科网（北京）股份有限公司 $