Unit 2 语法精讲精练 2026-2027学年人教版英语九年级上册

Unit 2 语法精讲精练

一、核心语法：it 作形式主语

（一）句型 1：It is + 形容词 + of sb. to do sth.

适用形容词：描述人的品质、性格

kind, nice, good, brave, wise, foolish, careless, honest, generous

含义：某人做某事，真是……

句式拆解

It（形式主语）+ be + 品质形容词 + of + 人 + to do sth.（真正主语）

例句：It was brave of Yuan Longping to devote himself to rice research.

袁隆平投身水稻研究，十分勇敢。

It is wise of Confucius to teach people to respect elders.

孔子教导人们尊敬长辈，十分明智。

同义转换（可还原成 sb. + be + 形容词 + to do）

He was brave to stand up for common people.

= It was brave of him to stand up for common people.

（二）句型 2：It is + 形容词 + for sb. to do sth.

适用形容词：描述事情本身难易、重要、价值

important, necessary, helpful, difficult, easy, amazing, interesting, inspiring, wonderful

含义：对某人来说，做某事是……

句式拆解

It（形式主语）+ be + 事物形容词 + for + 人 + to do sth.（真正主语）

例句：It is necessary for us to follow teachers’ advice.

对我们来说，听从老师建议很有必要。

It was difficult for scientists to do research long ago.

在过去，科学家开展研究十分艰难。

同义转换（不可直接用人作主语）

Keep trying is important for us = It is important for us to keep trying.

（三）两类句型核心区分

句型	搭配形容词类型	介词	核心逻辑	例句
It’s +	人的品格：	of	夸赞 / 批评人的品性	It’s nice of her

adj. + of sb. to do	brave/wise/nice/careless			to encourage me.
It’s + adj. + for sb. to do	事情属性：important/difficult/amazing	for	评价这件事本身	It’s difficult for kids to finish the task.

（四）时态变化规则

描述过去发生的事：It was + adj. …It was inspiring that he realized his dream.

描述常态、客观道理、现在：It is + adj. …\It is important for us to learn from great people.

（五）拓展：It was + adj. + that 从句

当后面是完整句子，不用不定式 to do 时，用 that 引导从句，仅用过去时描述往事。

结构：It was + inspiring/amazing/strange + that + 完整陈述句

例句：It was amazing that she kept doing research all her life.

令人惊叹的是，她一生都坚持科研。

二、两大句型改写方法

普通陈述句 → It 形式主语 for 句型

原句：We need to keep practising.

改写：It is necessary for us to keep practising.

主语是人、体现品格 → It 形式主语 of 句型

原句：He was brave to fight for ordinary people.

改写：It was brave of him to fight for ordinary people.

完整事件句子 → It was + adj. + that 从句

原句：His dream finally came true.

改写：It was inspiring that his dream finally came true.

三、分层专项训练

专项一 4a 基础补全句子

仿照句式填写合适名人 / 身边人物