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人教英语九上Unit2语法讲解及习题：It 固定句型（it作形式主语+强调句）
一、本单元核心语法
本单元 核心语法有2大重点句型：
It is/was + 形容词 + (for/of sb.) to do sth.（it作形式主语，真正主语为动词不定式）
It is/was ... that ...（强调句型）
二、语法精讲
（一）核心句型1：It is/was + adj. + (for/of sb.) to do sth.
1. 基础结构拆解
完整公式：
It + be动词(am/is/are/was/were) + 形容词 + for/of + 某人 + to do + 真正动作
it：没有实际含义，叫形式主语，只是占位，避免句子头重脚轻
真正主语：末尾的 to do 不定式（做某事这个行为）
中文翻译：（某人）做某事是……的
教材原句参考：
It was great of ... to develop a new kind of rice.
It is always important for us to keep going in life.
基础例句（贴合本单元“励志榜样、伟人精神”话题）：
It is important for us to learn from great people.
对我们来说，向伟人学习是很重要的。
It was brave of him to face all the difficulties.
他直面所有困难，非常勇敢。
2. 必考难点：for sb. 和 of sb. 的区别
of sb. 的用法
形容词是用来评价人的品质、性格、德行
常见形容词：kind（善良的）、brave（勇敢的）、wise（明智的）、nice（友善的）、good、honest、careless、stupid
核心判断技巧：句子可以改写为 Sb. + be + 形容词，逻辑通顺
例：It was wise of Confucius to say that.
→ Confucius was wise. 逻辑成立，所以用of
for sb. 的用法
形容词是用来评价事情、行为本身的难易、好坏、必要性，和人的品性无关
常见形容词：important（重要的）、necessary（必要的）、difficult（困难的）、easy、hard、dangerous、helpful、possible
核心判断技巧：无法改写成 Sb. + be + 形容词
例：It is difficult for common people to do that work.
→ People are difficult. 逻辑不通，所以用for
3. 时态变化
描述现在、普遍道理：It is + adj.
描述过去发生的事、古人过往事迹：It was + adj.
4. 否定句&一般疑问句
否定：It is/was not + adj. + for/of sb. to do sth.
例：It is not easy for him to finish the task.
疑问：Is/Was it + adj. + for/of sb. to do sth.
例：Was it amazing for her to make such an achievement
（二）核心句型2：强调句型 It is/was ... that ...
1. 基础结构
It is/was + 被强调部分 + that + 句子剩余部分
作用：专门突出、加重句子里想要重点强调的成分（主语、宾语、状语）
不管强调什么成分，连接词永远用that（强调人也可以用who）
现在时态用 It is，过去时态用 It was
2. 用法&例句
原句：Yuan Longping developed new rice in China last year.
袁隆平在中国培育出新型水稻。
强调主语：It was Yuan Longping that/who developed new rice in China last year.
强调宾语：It was new rice that Yuan Longping developed in China last year.
强调地点状语：It was in China that Yuan Longping developed new rice last year.
强调时间状语：It was last year that Yuan Longping developed new rice in China.
3. 快速判断强调句技巧
去掉It is/was 和 that，剩下的单词重新排列，依然是完整通顺的句子，就是强调句。
4. 和定语从句的区别（拓展易错点）
强调句：去掉框架句子依然完整
定语从句：去掉框架句子结构会残缺
（三）教材拓展同类it句型
It seems + that从句：看起来……
It seems impossible for sb. to do sth. 某人似乎不可能做某事
教材例句：It seemed impossible for him to finish the task.
It is + 名词 + to do sth. 做某事是……
例：It is a great honor to meet the great scientist.
三、专项练习题
用for/of 填空
It is kind ____________ you to help others.
It is hard ____________ us to finish hard work.
It was brave ____________ him to fight against difficulties.
It is necessary ____________ students to study hard.
It was clever ____________ the scientist to solve the problem.
It is dangerous ____________ kids to swim alone.
It is nice ____________ her to encourage her friends.
It is important ____________ everyone to never give up.
It was foolish ____________ him to give up the chance.
It is easy ____________ me to understand the story.
单项选择题
It is really nice ____________ you to support and encourage others.
A. for B. of C. to
____________ important for us ____________ learn the spirit of inspiring people.
A. It; to B. It's; to C. That; for
It was ____________ Zhang Qian to travel such a long way.
A. brave for B. brave of C. bravely of
It ____________ difficult for people to do that work in the old days.
A. is B. was C. were
—____________ is helpful ____________ us to read biographies.
—Yes, we can learn a lot.
A. It; for B. That; for C. It; of
It was wise ____________ Confucius ____________ teach people to be polite.
A. of; to B. for; to C. of; for
It ____________ amazing that the little boy knew so much.
A. is B. was C. are
It is not ____________ for everyone to become famous, but we can still be great.
A. easily B. easy C. easiness
It was ____________ of the doctor to save so many people's lives.
A. kind B. kindly C. kindness
It is only ____________ you to decide your future.
A. of B. for C. to
It was in 1973 ____________ Yuan Longping developed hybrid rice.
A. when B. that C. which
____________ it necessary for us to keep going when we are in trouble
A. Is B. Was C. Are
句型改写
To help people is good.（改为it作形式主语）
_____________________________________________________________________
He is brave to stand up for the weak.（用It was...of sb.改写）
_____________________________________________________________________
We should respect our elders. It is wise.（合并为It was wise of...句型）
_____________________________________________________________________
We learn great people's stories. It is always inspiring.（用It is + adj. + to do改写）
_____________________________________________________________________
The scientist made great achievements last year.（改为强调句，强调主语）
_____________________________________________________________________
It is helpful for us to listen to teachers.（改为否定句）
_____________________________________________________________________
句子改错
It was very kind for you to help me.
_____________________________________________________________________
It important for us to never give up.
_____________________________________________________________________
It was difficult of him to finish the hard work.
_____________________________________________________________________
It is amazing which he made such great progress.
_____________________________________________________________________
句子翻译
对我们来说，向榜样学习非常有意义。
_____________________________________________________________________
这位科学家付出一生奉献科研，太伟大了。
_____________________________________________________________________
四、参考答案
用for/of填空 答案&解析
of （kind形容人的品格）
for （hard形容事情难度）
of （brave形容人的品质）
for （necessary形容事情必要性）
of （clever形容人的特质）
for （dangerous形容行为属性）
of （nice形容人的品性）
for （important形容事）
of （foolish形容人的行为特质）
for （easy形容事情难易）
单项选择题 答案&解析
B
解析：nice形容人的善良品性，用of。
B
解析：固定句型It's + adj. + for sb. to do sth.
B
解析：brave是夸赞人的勇敢品质，用of。
B
解析：in the old days 表示过去，时态用一般过去时，主语it用was。
A
解析：helpful形容事情对人的作用，用for，开头固定It。
A
解析：wise评价孔子本人的智慧，用of，后面加to do不定式。
B
解析：knew为一般过去时，时态保持一致，用was。
B
解析：be动词后加形容词原形easy。
A
解析：be动词后接形容词kind作表语。
B
解析：这件事由你来决定，描述事情属性，用for。
B
解析：典型强调句型It was...that...，强调时间状语。
A
解析：描述普遍道理，一般现在时，主语it用is。
句型改写 答案
It is good to help people.
It was brave of him to stand up for the weak.
It was wise of us to respect our elders
It is always inspiring to learn great people's stories.
It was the scientist that/who made great achievements last year.
It is not helpful for us to listen to teachers.
句子改错 答案&解析
for → of
解析：kind形容人的品格，必须用of。
It → It's (It is)
解析：句子缺少谓语动词be。
of → for
解析：difficult形容工作这件事很难，不是评价人本身，改为for。
which → that
解析：本句为主语从句/固定强调结构，固定用that。
句子翻译 参考答案
It is very meaningful for us to learn from role models.
It was great of the scientist to devote all his life to scientific research.

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