人教版高中英语选修三Unit 1语法课件
- 2026-10-01 08:02:01
My dream is to...
My plan is to...
The best way is to...
My goal is to...
这些学生非常熟悉的表达,其实都指向这一课的核心语法:
Infinitives as the Predicative
动词不定式作表语。
这次更新的是:
✨ 人教版选择性必修三 Unit 1 Discover Useful Structures 授课PPT
共 14页。


🔍 先回到上一篇课文里“找规律”
语法课没有一上来直接给规则。
而是先重新观察 A Short History of Western Painting 中的句子:
Perhaps the best way to understand Western art is to look at the development of Western painting over the centuries.
During the Middle Ages, the purpose of Western art was to teach people about Christianity.
In this work, Monet’s aim was to convey the light and movement in the scene.
What they attempted to do was no longer show reality, but instead to ask the question, “What is art?”
学生先观察:
way
purpose
aim
以及:
What they attempted to do
再看后面的不定式到底在说明什么。
规律就比较容易发现了:
这些 to do 都是在进一步说明主语的具体内容或目的。



✨ 哪些主语后面特别容易出现“be + to do”?
课件继续把规律系统整理出来。
当主语是:
dream
goal
aim
purpose
plan
等表示:
意向、目标、计划、打算
的词时,后面经常使用不定式作表语。
比如:
My plan for the winter holiday is to visit my friend in Australia.
其实可以直接理解成:
我的计划是什么?
→ to visit my friend
我的目标是什么?
→ to...
学生理解了这种“主语内容解释”的关系,就不用把它当成一条特别抽象的语法规则去背。

📌 但“be + to do”还不只有这一种用法
这一课继续补充了几个比较常见的情况。
比如:
To see is to believe.
主语是不定式时,表语也可以使用不定式。
再比如:
I am to set out for China next week.
可以表示安排;
You are to have a face-to-face talk with them.
可以表示劝告;
Children are not to smoke.
则表示禁止。
同样一个 be + to do,放进不同语境以后,表达的意义也会发生变化。
⚠️ 还有两个学生比较容易忽略的点
一个是:
主动形式表达被动意义。
比如:
He is to blame for the fire.
The house is to let.
另一个是:
如果主语部分含有 do 的某种形式,作表语的不定式可以省略 to。
比如上一篇阅读里的:
What they attempted to do was no longer show reality...
以及:
Anything we can do is guarantee it will be delivered on time.
这几个特殊点单独拎出来以后,学生做题时会清楚很多。

📝 学完规则,马上放进完整语境里
练习部分没有只停在:
to do还是doing?
而是设置了一篇健康饮食语篇。
比如:
If your aim is to stay healthy...
the “food pyramid” — a chart whose purpose is to instruct you how to eat healthily
学生在完整语篇里继续判断不同不定式的功能,同时还要区分:
to stay
to plan
to save
to instruct
to eat
以及:
eating
为什么形式不同。
这样语法规则就不会只停留在表格里。

✍️ 再往前一步:直接迁移到写作表达
后面的翻译句子都比较实用。
比如:
The purpose of my writing this e-mail is to express my wishes to my friends working abroad.
以及:
I believe the best way to build a great team is to gather a group of talented people.
还有:
What he intends to do is (to) buy a practical gift for his father.
这些结构以后写应用文时都能直接迁移。
尤其是:
The purpose of...is to...
The best way to...is to...
属于学生掌握以后很容易真正用起来的句型。


💬 最后,不做题了——聊聊自己的梦想和计划
这一课最后把语法真正拉回学生自己。
两人一组讨论:
What’s your biggest dream/ambition in life?
How are you going to achieve your goal?
Do you have any plans?
What might be difficult for you?
How are you going to deal with it?
并要求尽量使用:
My biggest dream/ambition in life is to...
My plan is to...
The best way to...is...
One of the hardest things might be...
范例里,一个学生的梦想是成为:
an environmental scientist
他的计划是:
to study hard and major in environmental science at university
最终希望:
to conduct meaningful research。
到这里,学生就不再只是:
“我知道不定式可以作表语。”
而是能够用这个结构真正说自己的:
dreams, ambitions, plans and goals.



整节课的路径比较清楚:
课文原句观察 → 发现不定式功能 → 句子匹配 → 规则归纳 → 特殊用法 → 单句+语篇练习 → 翻译迁移 → 梦想与目标对话输出
从:
“be后面为什么是to do?”
逐渐走向:
“我能用to do说明自己的目标、计划和打算。”
如果你正在教 人教版选择性必修三 Unit 1 ART,刚好讲到 Infinitives as the Predicative,想把这节语法课讲得更清楚、更贴近学生实际表达,这套可以根据班级学情直接增删使用。
需要 X3U1 Discover Useful Structures 授课PPT的老师,可以私信我~🎨