《2025年创新设计高中英语选择性必修第二册北师大版》

1. it 在句中作形式主语
[先感知]
①It is reported that living spaces for wild-life are being reduced due to the cutting of trees.(人教必二 U2)
据报道，由于树木被砍伐，野生动物的生存空间正在缩小。
②It’ll be too tiring to walk or dance for a long time in those shoes.(人教必三 U1)
穿着那双鞋长时间走路或跳舞会太累人了。
③But it is vital not to take any chances.
(外研选二 U4)
但重要的是不要心存侥幸。
④ When I saw the tragic scenes on the news, I felt it was my duty as a doctor to go there and offer my help.(外研选二 U4)
当我在新闻上看到悲惨的场面时，我觉得作为一名医生，我有责任去那里提供帮助。
⑤It is important to remember that Ebola doesn’t respect national boundaries.
(外研选二 U4)
最重要的是要记住，埃博拉不分国界。
[会发现] It 在一些固定句型中可以作形式主语替代动词不定式 或主语从句 。
[明规则] it 作为形式主语常用于下面句型中：
(1)It be＋adj.＋(for sb) to do...(对某人来说)做……是……的。(常用于此句型的形容词有 possible、necessary、important、easy、strange、natural 等)
[名师指津] 此句型中从句一般用虚拟语气，即(should) do(should) do。
(5)It be＋过去分词＋that...据……。(常用于本句型的过去分词有 said、announced、believed、reported、known、hoped 等)
(6)It be＋n.＋that...做……是……的。(常用于此句型的名词有 pity、honour、shame、won-der 等)
[对点练 3] 完成句子
①It is impossible to solve the complex math problem without careful thinking.
不经过仔细思考就解决这道复杂的数学题是不可能的。
②It is no use giving him some advice.
给他一些忠告是没有用的。
③It is worthwhile paying attention to their value in application.
它们具有的使用价值是值得重视的。
④It was said that she had given up her dream job to travel the world.
据说她放弃了梦寐以求的工作去环游世界了。
⑤It’s a pity that you missed the wonderful concert last night.
很遗憾你错过了昨晚那场精彩的音乐会。

答案： 1.动词不定式 主语从句
对点练3
①It is impossible to solve the complex math problem
②It is no use giving ③It is worthwhile paying attention to
④It was said that ⑤It’s a pity that

2. it 在句中作形式宾语
[先感知]
①I felt it a pity to have my trip ended so soon.(人教必二 U4)
我觉得我的旅行这么快就结束了，真是太遗憾了。
②No visitor would think it surprising that the island is a UNESCO World Heritage Site.(外研选二 U5)
没有游客会对该岛被联合国教科文组织列为世界自然遗产感到惊讶。
③Experts felt it necessary to come up with a plan to remove all the rabbits from the is-land.(外研选二 U5)
专家们认为有必要想出一个计划，除掉岛上所有的兔子。
④This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all.(外研选二 U5)
这件事清楚地表明，大鼠、小鼠和兔子的问题需要一劳永逸地解决。
⑤These days, people have found it a threat to other species to release these turtles into the wild.(外研选二 U5)
如今，人们已经发现将这些海龟放归野外会对其他物种构成威胁。
[会发现] 当复合宾语中的宾语是不定式 、动名词或宾语从句 时，往往把宾语放在它的补足语后面，而用 it 作形式宾语 ，放在宾语补足语之前。常用的动词有 think、believe、make、find、consider、feel 等。
[明规则] it 作为形式宾语常用于句型“动词＋it＋形容词/名词＋(for sb) to do/动名词/that 从句”中。常用动词有 think、believe、suppose、consider、feel、make、keep 等。
[对点练 4] 完成句子
①Ifound it very interesting to study English.
我发现学英语非常有趣。
②Hemade it clear that he was not interested in this subject.
他非常清楚地表示他对这门学科不感兴趣。
③Ithink it important that you(should) attend the conference.
我认为你去参加这个会议很重要。
④Hethought it no use trying to convince them.
他认为说服他们没有用。

答案： 2.不定式 宾语从句 形式宾语
对点练4
①found it very interesting to study English
②made it clear that he was not interested in this subject
③think it important that ④thought it no use trying