形容词三句式

形容词三句式
牛津八年级下学期Unit6课本同步辅导，针对本单元重点语法详细解释，巩固课堂所学。

[热身训练] 用“It is + 形容词(+ for …)…”
连词成句。

1. polite/students often give seats to the elderly on the bus
_____________________________________
2. finish all the homework in an hour/impossible
_____________________________________
3. go swimming alone/her/dangerous
_____________________________________
4. walk a 100-kilometre trail within 48 hours/tough
_____________________________________
5. meaningful/work for ORBIS/Dr Ma
_____________________________________
6. sad/some children in poor areas cannot go to school
_____________________________________
[一点就通] 英语中，我们可以在某些固定句式中使用形容词来提供关于某人或某物的相关信息。

这类固定句式主要有下面三种：
句式一：It is + adj. + that从句
此句式用来说明我们对某事的感受。

其中it是形式主语，而放在句尾的that从句才是真正的主语。

例如：
It is dangerous that you cross the road now. 现在你穿过马路是很危险的。

句式二：It is + adj. + to do sth
此句式也用来说明我们对某事的感受，意思是“做某事怎么样”。

其中it是形式主语，真正的主语是后面的动词不定式短语。

例如：
It’s pleasant to meet old friends here. 在这儿遇见老朋友真让人高兴。

另外，此句式中的形容词也可以是名词(短语)。

例如：
It’s a good idea to organize a charity show. 举行慈善义演是一个好主意。

句式三：It is + adj. + for sb + to do sth
在此句式的意思是“对某人来说做某事怎么样”。

其中for引出动词不定式的逻辑主语，指明我们说的是谁。

例如：
It is important for you to read English every day. 对你来说，每天读英语是很重要的。

该句式有时可与句式一互换使用。

例如：
It’s necessary for us to raise money for Project Hope. = It’s necessary that we raise m oney for Project Hope. 我们有必要为希望工程筹资。

Key:
1. It is polite that students often give seats to the elderly on the bus.
2. It is impossible to finish all the homework in an hour.
3. It is dangerous for her to go swimming alone.
4. It is tough to walk a 100-kilometre trail within 48 hours.
5. It is meaningful for Dr Ma to work for ORBIS.
6. It is sad that some children in poor areas cannot go to school.。