Unit 5 Play by the rules 语法专项——动词不定式表目的课件(共28张PPT)外研版英语八年级上册

(共28张PPT)
教学课件
外研版八年级上册
Unit 5 语法专项——动词不定式表目的
全解精讲+分层练习
学习目标
1.掌握不定式表目的的核心结构与用法
2.区分to do/in order to do/so as to do的差异
3.学会目的状语的同义转换及易混点辨析
4.能熟练运用该语法完成各类题型
一、语法定义
动词不定式（to do）表目的，指用to do结构
说明动作发生的目的或意图，即“做某事为了做另一件事”
在句中作目的状语，位置灵活
可置于句子末尾，也可置于句子开头
二、核心用法1：基本结构（句末作状语）
最常用结构：主语 + 谓语 + 宾语/状语 + to do sth.
作用：说明动作的目的，无需强调
例句1：He went to the library to borrow some books.
例句2：She studies hard to pass the exam.
二、核心用法1：基本结构（句首作状语）
强调目的结构：To do sth., 主语 + 谓语 + 其他.
注意：句首不定式后用逗号与主句隔开
例句1：To catch the early bus, he got up at 5 o’clock.
例句2：To improve my English, I take an online course daily.
二、核心用法2：三者对比
结构 位置要求 否定形式
to do 句首/句末 not to do
in order to do 句首/句末 in order not to do
so as to do 仅句末 so as not to do
二、核心用法2：in order to do 例句
句末：We practiced hard in order to win the match.
句首：In order to win the match, we practiced hard.
否定：In order not to miss the train, we hurried up.
总结：可放句首/句末，否定直接加not在to前
二、核心用法2：so as to do 例句
句末正例：He spoke quietly so as to wake the baby.
句首错例：So as to wake the baby, he spoke quietly.
否定：He spoke quietly so as not to wake the baby.
总结：只能放句末，否定为so as not to do
二、核心用法3：目的状语的从句表达
除了不定式，还可用从句表目的
后接完整句子，常搭配can/could/will/would
两种核心结构：so that + 从句
in order that + 从句
二、核心用法3：so that + 从句
用法：日常表达，仅置于句末
常配情态动词：can/could（最常用）
原句：He studies hard to pass the exam.
转换：He studies hard so that he can pass the exam.
要点：补充主语，保持语义一致
二、核心用法3：in order that + 从句
用法：正式表达，可置于句首/句末
常配情态动词：could/would
原句：To arrive on time, we left early.
转换：In order that we could arrive on time, we left early.
要点：句首用逗号，与主句分隔
三、易混点提醒1：不定式表目的vs作宾语
表目的：不定式是状语，修饰整个句子
说明“做某事的目的是什么”
作宾语：不定式是宾语，跟在动词后
回答“动词的对象/内容是什么”
三、易混点提醒1：对比例句（表目的）
1.She bought a pen to write with.
（to write with修饰bought，表买笔的目的）
2.He opened the door to let the cat in.
（to let the cat in修饰opened，表开门的目的）
3.We read books to gain knowledge.
（to gain knowledge修饰read，表读书的目的）
三、易混点提醒1：对比例句（作宾语）
1.She wants to buy a pen.
（to buy a pen是want的宾语，回答“想要做什么”）
2.He hopes to travel around the world.
（to travel是hope的宾语，回答“希望做什么”）
3.They decide to study hard.
（to study hard是decide的宾语，回答“决定做什么”）
三、易混点提醒2：不定式符号to vs 介词to
表目的的to：不定式符号，后接动词原形
介词to：属于固定搭配，后接动词-ing形式
关键：判断to的词性，避免形式错误
技巧：熟记常考的介词to固定搭配
三、易混点提醒2：对比例句（不定式符号to）
1.He went to the supermarket to buy food.
（to表目的，后接buy原形）
2.To learn English, we read every day.
（to表目的，后接learn原形）
3.They run every morning to keep fit.
（to表目的，后接keep原形）
三、易混点提醒2：对比例句（介词to）
常考固定搭配：
1.look forward to doing（期待做）
2.pay attention to doing（注意做）
3.be used to doing（习惯于做）
例句：He is looking forward to seeing his friend.
语法小练1：用所给动词的适当形式填空
1.She goes to the park _________ (fly) a kite every weekend.
2._________ (make) more progress, we need to work harder.
3.My mother gets up early _________ (cook) breakfast for us.
4.____________ (not miss) the film, we left the house at 6 p.m.
to fly
To make
to cook
Not to miss
语法小练2：同义句转换
1.I study hard to get good grades.（用in order to改写）
2.She saves money to buy a new bike.（用so as to改写）
3.To improve my listening, I listen to English songs.（用in order to改写句首）
I study hard in order to get good grades.
She saves money so as to buy a new bike.
In order to improve my listening, I listen to English songs.
语法小练3：同义句转换
1.He runs fast to catch the bus.（用so that改写）
2.We practice speaking to talk with foreigners.（用so that改写）
3.To finish the work early, they work together.（用in order that改写）
He runs fast so that he can catch the bus.
We practice speaking so that we can talk with foreigners.
They work together in order that they can finish the work early,
题型一：用所给动词的适当形式填空
1.___________ (keep) the classroom clean, we clean it every day.
2.He turned down the TV ___________ (not disturb) his parents.
3.They go to the cinema ___________ (watch) a new movie.
4.___________ (improve) his math, he does exercises every night.
5.She takes notes ___________ (remember) the key points.
To keep
not to disturb
to watch
To improve
to remember
题型二：改写句子
1.We drink milk every day to keep healthy.（用so that改写）
2.To catch the plane, they took a taxi.（用in order that改写）
3.He studies late to finish his homework.（用so as not to改否定）
4.She practices dancing to win the competition.（用in order to改写）
5.We walk to school to save money.（用so as to改写）
We drink milk every day so that we can keep healthy.
In order that they could catch the plane, they took a taxi.
He studies late so as not to finish his homework.
She practices dancing in order to win the competition.
We walk to school so as to save money.
题型三：单项选择
1.He went to the hospital ______ his grandma.
A. visit B. to visit C. visiting
2.______ English well, he reads English every morning.
A. Learn B. To learn C. Learning
3.She works hard ______ she can go to a good school.
A. so that B. to C. in order to
B
B
A
题型三：单项选择
1.______ late, we must finish the work on time.
A. In order to not be B. Not to be C. So as not to be
2.He spoke loudly ______ everyone could hear him clearly.
A. so that B. in order to C. so as to
3.We keep quiet ______ disturb the students in the library.
A. in order not to B. not to C. so as to not
B
A
A
题型四：判断正误并改正
1.So as to learn English, he joined a club. ( )
2.He went to the shop for buying some fruit. ( )
3.To not be late, he got up early. ( )
4.She studies hard so that she pass the exam. ( )
5.I look forward to meet my pen pal. ( )
F
In order to learn English, he joined a club.
F
He went to the shop to buy some fruit.
F
Not to be late, he got up early.
F
She studies hard so that she can pass the exam.
F
I look forward to meeting my pen pal.
课堂小结1：核心知识点
1.不定式表目的作状语，位置灵活，句首表强调
2.in order to可句首/句末，so as to仅能放句末
3.否定结构需牢记，not的位置不可错
4.从句表目的后接完整句，常配can/could
课堂小结2：易混点复盘
1.表目的：修饰整个句子，说明动作意图
作宾语：跟在动词后，作动作的对象
2.符号to+动词原形，介词to+动词-ing
3.熟记介词to的固定搭配，避免形式错误
4.改写句子时，注意补充主语和情态动词
教学课件
Unit 5 语法专项——动词不定式表目的
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