Unit 6 Sunshine for all. It is +形容词+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+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 （四）否定形式 2 （五）疑问形式 2 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，根据要求完成句子（5题） 3 一、语法讲解 （一）基本结构 · 构成：It is + 形容词 + to do sth. · 例句：It is important to learn English well.（学好英语很重要。） （二）核心用法 · it 作形式主语：句首的 it 没有实际意义，只是为了避免句子头重脚轻，代替真正的主语放在句首。 · 真正主语是后面的动词不定式：句子想表达的核心内容是“做某事（to do sth.）是怎样的（形容词）”。 · 功能：用于表达对某件事的看法、评价或感受。 （三）常用形容词分类 · 重要性/必要性：important, necessary, essential · 难易程度：easy, hard, difficult, simple, tough · 对错/好坏：right, wrong, good, bad, polite, rude, clever, foolish · 情感/感受：interesting, boring, exciting, wonderful, nice, great, strange, normal · 可能性/安全性：possible, impossible, dangerous, safe, useful, useless （四）否定形式 · 在不定式符号 to 前加 not。 · 例句：It is not right to tell lies.（说谎是不对的。） （五）疑问形式 · Is it + 形容词 + to do sth.? · 例句：Is it necessary to wait for him?（有必要等他吗？） 二、中考题型练习题（30道） （一）单项选择（15题） 1. It is very important ______ English well. A. learn B. to learn C. learning D. learned 2. It is dangerous ______ in the river alone. A. swim B. to swim C. swimming D. swam 3. It is not easy ______ a foreign language. A. master B. mastering C. to master D. mastered 4. It is interesting ______ different kinds of animals in the zoo. A. see B. to see C. seeing D. saw 5. It is necessary ______ plenty of water every day. A. drink B. drinking C. to drink D. drank 6. It is wrong ______ others' homework. A. copy B. copying C. to copy D. copied 7. It is impossible ______ there before 8 o'clock. A. get B. to get C. getting D. gets 8. It is dangerous ______ football in the street. A. play B. to play C. playing D. played 10. It is boring ______ the same story again and again. A. hear B. to hear C. hearing D. heard 11. It is useful ______ some basic computer skills. A. learn B. to learn C. learning D. learned 12. It is not polite ______ loudly in public. A. talk B. to talk C. talking D. talked 13. It is exciting ______ a football match. A. watch B. to watch C. watching D. watched 14. It is hard ______ such a difficult question. A. answer B. to answer C. answering D. answered 15. It is wonderful ______ along the beach at sunset. A. walk B. to walk C. walking D. walked （二）用所给词的适当形式填空（10题） 1. It is not easy _____________ (learn) a new language well. 2. Is it necessary _____________ (finish) the work today? 3. It is dangerous _____________ (drive) after drinking. 4. It is very important _____________ (read) English every morning. 5. It is interesting _____________ (play) chess with friends. 6. It is wrong _____________ (laugh) at people in trouble. 7. It is useful _____________ (know) some first aid knowledge. 8. It is boring _____________ (wait) for the bus for a long time. 9. It is great _____________ (have) a picnic on a sunny day. 10. It is impossible _____________ (please) everyone. （三）句型转换，根据要求完成句子（5题） 1. To learn English well is important. (改为同义句) ______ ______ important ______ ______ English well. 2. To swim in the river is dangerous. (改为同义句) ______ ______ dangerous ______ ______ in the river. 3. To get there on time is not easy. (改为同义句) ______ ______ not easy ______ ______ there on time. 4. Is it good to eat too much junk food? (改为陈述句) ______ ______ good ______ ______ too much junk food. 5. It is very useful to learn a second language. (改为否定句) ______ ______ very useful ______ ______ a second language. 1 学科网（北京）股份有限公司 $ Unit 6 Sunshine for all. （It is +形容词+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 （四）否定形式 2 （五）疑问形式 2 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，根据要求完成句子（5题） 3 一、语法讲解 （一）基本结构 · 构成：It is + 形容词 + to do sth. · 例句：It is important to learn English well.（学好英语很重要。） （二）核心用法 · it 作形式主语：句首的 it 没有实际意义，只是为了避免句子头重脚轻，代替真正的主语放在句首。 · 真正主语是后面的动词不定式：句子想表达的核心内容是“做某事（to do sth.）是怎样的（形容词）”。 · 功能：用于表达对某件事的看法、评价或感受。 （三）常用形容词分类 · 重要性/必要性：important, necessary, essential · 难易程度：easy, hard, difficult, simple, tough · 对错/好坏：right, wrong, good, bad, polite, rude, clever, foolish · 情感/感受：interesting, boring, exciting, wonderful, nice, great, strange, normal · 可能性/安全性：possible, impossible, dangerous, safe, useful, useless （四）否定形式 · 在不定式符号 to 前加 not。 · 例句：It is not right to tell lies.（说谎是不对的。） （五）疑问形式 · Is it + 形容词 + to do sth.? · 例句：Is it necessary to wait for him?（有必要等他吗？） 二、中考题型练习题（30道） （一）单项选择（15题） 1. It is very important ______ English well. A. learn B. to learn C. learning D. learned 2. It is dangerous ______ in the river alone. A. swim B. to swim C. swimming D. swam 3. It is not easy ______ a foreign language. A. master B. mastering C. to master D. mastered 4. It is interesting ______ different kinds of animals in the zoo. A. see B. to see C. seeing D. saw 5. It is necessary ______ plenty of water every day. A. drink B. drinking C. to drink D. drank 6. It is wrong ______ others' homework. A. copy B. copying C. to copy D. copied 7. It is impossible ______ there before 8 o'clock. A. get B. to get C. getting D. gets 8. It is dangerous ______ football in the street. A. play B. to play C. playing D. played 10. It is boring ______ the same story again and again. A. hear B. to hear C. hearing D. heard 11. It is useful ______ some basic computer skills. A. learn B. to learn C. learning D. learned 12. It is not polite ______ loudly in public. A. talk B. to talk C. talking D. talked 13. It is exciting ______ a football match. A. watch B. to watch C. watching D. watched 14. It is hard ______ such a difficult question. A. answer B. to answer C. answering D. answered 15. It is wonderful ______ along the beach at sunset. A. walk B. to walk C. walking D. walked （二）用所给词的适当形式填空（10题） 1. It is not easy _____________ (learn) a new language well. 2. Is it necessary _____________ (finish) the work today? 3. It is dangerous _____________ (drive) after drinking. 4. It is very important _____________ (read) English every morning. 5. It is interesting _____________ (play) chess with friends. 6. It is wrong _____________ (laugh) at people in trouble. 7. It is useful _____________ (know) some first aid knowledge. 8. It is boring _____________ (wait) for the bus for a long time. 9. It is great _____________ (have) a picnic on a sunny day. 10. It is impossible _____________ (please) everyone. （三）句型转换，根据要求完成句子（5题） 1. To learn English well is important. (改为同义句) ______ ______ important ______ ______ English well. 2. To swim in the river is dangerous. (改为同义句) ______ ______ dangerous ______ ______ in the river. 3. To get there on time is not easy. (改为同义句) ______ ______ not easy ______ ______ there on time. 4. Is it good to eat too much junk food? (改为陈述句) ______ ______ good ______ ______ too much junk food. 5. It is very useful to learn a second language. (改为否定句) ______ ______ very useful ______ ______ a second language. 答案和解析 （一）单项选择（15题） 1. 【答案】B 【解析】 本题考查“It is + 形容词 + to do sth.”句型。it是形式主语，真正的主语是后面的动词不定式，表示“做某事是怎样的”。选项中只有to learn是不定式形式。A是动词原形，不能作主语；C是动名词，但本句型要求不定式；D是过去分词，不符合。 2. 【答案】B 【解析】 同上。It is dangerous to do sth.意为“做某事是危险的”。A、C、D都不符合句型结构。 3. 【答案】C 【解析】 It is not easy to do sth.意为“做某事不容易”。句中not是否定形式，放在is后面，但不定式符号to不变。 4. 【答案】B 【解析】 It is interesting to do sth.意为“做某事很有趣”。这是表达对事情看法的常用句型。 5. 【答案】C 【解析】 It is necessary to do sth.意为“做某事是必要的”。每天喝足够的水是必要的，因此用不定式to drink。 6. 【答案】C 【解析】 It is wrong to do sth.意为“做某事是错误的”。抄袭别人作业是错误的，用to copy。 7. 【答案】B 【解析】 It is impossible to do sth.意为“做某事是不可能的”。8点前到达那里不可能，用to get。 8. 【答案】B 【解析】 It is dangerous to do sth.意为“做某事是危险的”。在街上踢足球危险，用to play。 10. 【答案】B 【解析】 It is boring to do sth.意为“做某事很无聊”。反复听同一个故事很无聊，用to hear。 11. 【答案】B 【解析】 It is useful to do sth.意为“做某事很有用”。学习一些基本电脑技能有用，用to learn。 12. 【答案】B 【解析】 It is not polite to do sth.意为“做某事不礼貌”。在公共场合大声说话不礼貌，用to talk。 13. 【答案】B 【解析】 It is exciting to do sth.意为“做某事令人兴奋”。看足球比赛令人兴奋，用to watch。 14. 【答案】B 【解析】 It is hard to do sth.意为“做某事很难”。回答这么难的问题很难，用to answer。 15. 【答案】B 【解析】 It is wonderful to do sth.意为“做某事很棒”。日落时沿着海滩散步很棒，用to walk。 （二）用所给词的适当形式填空（10题） 1. 【答案】to learn 【解析】 It is not easy to do sth.句型，意为“做某事不容易”。学好一门新语言不容易。 2. 【答案】to finish 【解析】 这是一个疑问句，但结构仍是It is + adj. + to do sth.。Is it necessary to finish...？意为“有必要完成……吗？” 3. 【答案】to drive 【解析】 It is dangerous to do sth.意为“做某事危险”。酒后驾车危险。 4. 【答案】to read 【解析】 It is important to do sth.意为“做某事很重要”。每天早上读英语很重要。 5. 【答案】to play 【解析】 It is interesting to do sth.意为“做某事有趣”。和朋友下棋很有趣。 6. 【答案】to laugh 【解析】 It is wrong to do sth.意为“做某事是错误的”。嘲笑有困难的人是不对的。 7. 【答案】to know 【解析】 It is useful to do sth.意为“做某事有用”。了解一些急救知识很有用。 8. 【答案】to wait 【解析】 It is boring to do sth.意为“做某事无聊”。等公交车很长时间很无聊。 9. 【答案】to have 【解析】 It is great to do sth.意为“做某事很好”。在晴天野餐很好。 10. 【答案】to please 【解析】 It is impossible to do sth.意为“做某事不可能”。取悦每个人是不可能的。 （三）句型转换，根据要求完成句子（5题） 1. 【答案】It is；to learn 【解析】 原句“To learn English well is important.”是不定式短语作主语。改为同义句时，用it作形式主语，把真正的主语to learn English well放到后面，即“It is important to learn English well.”。 2. 【答案】It is；to swim 【解析】 同上。原句不定式作主语，改为it作形式主语的句子：“It is dangerous to swim in the river.”。 3. 【答案】It is；to get 【解析】 原句为否定形式，改为it句型时，否定词not移到is后面，构成“It is not easy to get there on time.”。 4. 【答案】It is；to eat 【解析】 原句是疑问句，改为陈述句只需去掉疑问语序，恢复为“It is good to eat too much junk food.”。注意：原句中的too much表示“太多”，在陈述句中保留。 5. 【答案】It is not；to learn 【解析】 肯定句改为否定句，在be动词is后加not。原句“It is very useful to learn a second language.”变为“It is not very useful to learn a second language.”。 1 学科网（北京）股份有限公司 $