摘要：该句型中，“it”为形式主语，真正的主语是后面的“to do sth.”不定式结构，“for sb.”表示动作的执行者。这种结构使句子避免头重脚轻，保持平衡。常用于此句型的形容词有：important（重要的）、necessary（必要的）、difficult
It + be + 形容词 + for sb. to do sth. 句型详解与双语例句
该句型中，“it”为形式主语，真正的主语是后面的“to do sth.”不定式结构，“for sb.”表示动作的执行者。这种结构使句子避免头重脚轻，保持平衡。常用于此句型的形容词有：important（重要的）、necessary（必要的）、difficult（困难的）、easy（容易的）、possible（可能的）等。
双语例句
1. It is important for students to study hard.（对于学生来说努力学习是重要的。）
2. It is necessary for us to protect the environment.（对我们而言保护环境是必要的。）
3. It is difficult for him to solve this math problem.（对他来说解这道数学题是困难的。）
4. It is easy for her to sing this song.（她唱这首歌很容易。）
5. It is possible for them to finish the project on time.（他们按时完成这个项目是可能的。）
6. It is dangerous for children to play with fire.（孩子们玩火是危险的。）
7. It is helpful for you to read more books.（你多读书是有帮助的。）
8. It is useful for people to learn a foreign language.（人们学习一门外语是有用的。）
9. It is interesting for tourists to visit historical sites.（游客参观历史遗迹是有趣的。）
10. It is boring for me to watch this movie.（我看这部电影很无聊。）
11. It is exciting for players to win the game.（运动员赢得比赛是令人兴奋的。）
12. It is tiring for workers to work long hours.（工人们长时间工作是累人的。）
13. It is relaxing for her to listen to music.（她听音乐是放松的。）
14. It is challenging for him to climb the mountain.（他爬山是有挑战性的。）
15. It is expensive for families to travel abroad.（家庭出国旅行是昂贵的。）
16. It is cheap for customers to buy things in bulk.（顾客批量购买东西是便宜的。）
17. It is convenient for residents to live near the subway station.（居民住在地铁站附近是方便的。）
18. It is inconvenient for people to go to the airport during rush hour.（人们在高峰时段去机场是不方便的。）
19. It is suitable for plants to grow in fertile soil.（植物在肥沃的土壤中生长是合适的。）
20. It is unsuitable for the old to live in a noisy environment.（老年人住在嘈杂的环境中是不合适的。）
21. It is healthy for individuals to do regular exercise.（个人定期锻炼是健康的。）
22. It is unhealthy for people to eat too much junk food.（人们吃太多垃圾食品是不健康的。）
23. It is fortunate for us to have good friends.（我们有好朋友是幸运的。）
24. It is unfortunate for him to lose his wallet.（他丢了钱包是不幸的。）
25. It is reasonable for consumers to compare prices before buying.（消费者在购买前比较价格是合理的。）
26. It is unreasonable for the company to ask employees to work overtime without pay.（公司要求员工无偿加班是不合理的。）
27. It is proper for guests to arrive on time.（客人准时到达是恰当的。）
28. It is improper for students to talk loudly in the library.（学生在图书馆大声说话是不恰当的。）
29. It is polite for people to say “thank you” and “please”.（人们说“谢谢”和“请”是有礼貌的。）
30. It is impolite for him to interrupt others when they are speaking.（他在别人说话时打断是不礼貌的。）
31. It is common for people to make mistakes.（人们犯错误是常见的。）
32. It is uncommon for her to be late for school.（她上学迟到是不常见的。）
33. It is normal for teenagers to have mood swings.（青少年有情绪波动是正常的。）
34. It is abnormal for the machine to make such a strange noise.（机器发出这样奇怪的声音是不正常的。）
35. It is clear for everyone to understand the instructions.（每个人都清楚地理解这些指示。）
36. It is unclear for us what he really wants.（我们不清楚他真正想要什么。）
37. It is obvious for them to see the benefits of cooperation.（他们明显地看到合作的好处。）
38. It is not obvious for the child to solve the riddle.（这个孩子解这个谜语不明显。）
39. It is certain for the sun to rise in the east.（太阳从东方升起是确定的。）
40. It is uncertain for the weather to change suddenly.（天气突然变化是不确定的。）
41. It is advisable for us to take an umbrella with us.（我们带把伞是明智的。）
42. It is inadvisable for him to drive after drinking.（他酒后驾车是不明智的。）
43. It is essential for plants to get enough sunlight.（植物得到足够的阳光是必不可少的。）
44. It is non-essential for the party to have fancy decorations.（聚会有华丽的装饰不是必需的。）
45. It is significant for scientists to make new discoveries.（科学家有新发现是意义重大的。）
46. It is insignificant for the error to be ignored.（这个错误被忽略是微不足道的。）
47. It is vital for patients to get timely medical treatment.（病人得到及时治疗是至关重要的。）
48. It is not vital for the meeting to be held today.（会议今天举行不是至关重要的。）
49. It is urgent for the firefighters to put out the fire.（消防员灭火是紧急的。）
50. It is not urgent for the letter to be sent right away.（这封信不急于马上寄出。）
51. It is delightful for the family to get together.（家人团聚是令人愉快的。）
52. It is not delightful for him to work in a crowded office.（他在拥挤的办公室工作不是令人愉快的。）
53. It is preferable for her to choose the red dress.（她选择红色连衣裙是更可取的。）
54. It is not preferable for the plan to be changed at the last minute.（计划在最后一刻被改变是不可取的。）
55. It is feasible for the company to expand its business.（公司扩大业务是可行的。）
56. It is infeasible for the project to be completed within such a short time.（这个项目在这么短的时间内完成是不可行的。）
57. It is acceptable for the terms to be negotiated.（这些条款进行协商是可以接受的。）
58. It is unacceptable for the behavior to be tolerated.（这种行为被容忍是不可接受的。）
59. It is memorable for the couple to have their first dance.（这对夫妇的第一支舞是难忘的。）
60. It is forgettable for the movie to have such a simple plot.（这部电影情节如此简单是容易被遗忘的。）
61. It is imaginable for the artist to create a unique work.（艺术家创作一件独特的作品是可以想象的。）
62. It is unimaginable for the city to be without electricity.（城市没有电是难以想象的。）
63. It is regrettable for him to miss the opportunity.（他错过机会是令人遗憾的。）
64. It is not regrettable for the decision to be made.（做出这个决定不令人遗憾。）
65. It is praiseworthy for the volunteers to help the poor.（志愿者帮助穷人是值得赞扬的。）
66. It is not praiseworthy for him to seek only personal gain.（他只追求个人利益是不值得赞扬的。）
67. It is blameworthy for the student to cheat in the exam.（学生在考试中作弊是应受责备的。）
68. It is not blameworthy for the child to make an innocent mistake.（孩子犯一个无心的错误不是应受责备的。）
69. It is foreseeable for the technology to change our lives.（这项技术改变我们的生活是可预见的。）
70. It is unforeseeable for the accident to happen at that time.（事故在那个时候发生是不可预见的。）
71. It is negotiable for the price to be adjusted.（价格进行调整是可协商的。）
72. It is non-negotiable for the deadline to be extended.（截止日期延长是不可协商的。）
73. It is touchable for the surface to be smooth.（表面光滑是可触摸的。）
74. It is untouchable for the confidential document to be accessed.（机密文件被访问是不可触及的。）
75. It is separable for the parts to be taken apart.（这些部件被拆开是可分离的。）
76. It is inseparable for the two friends to be separated.（这两个朋友被分开是不可分离的。）
77. It is taxable for the income to be reported.（收入进行申报是应纳税的。）
78. It is non-taxable for the donation to be tax-free.（捐赠免税是不纳税的。）
79. It is renewable for the energy to be used again.（能源再次被使用是可再生的。）
80. It is non-renewable for the fossil fuel to be depleted.（化石燃料被耗尽是不可再生的。）
来源：蒙古元素