内容正文:
Unit 4 What makes things move?
核心语法点:形容词和副词的比较级与最高级(单音节词)
一、语法精讲
1. 定义:
· 比较级:用于两者之间的比较,表示"更……"
· 最高级:用于三者或三者以上的比较,表示"最……"
2. 单音节词变化规则
变化类型
规则
形容词/副词
比较级
最高级
一般情况
直接加 -er/-est
slow
fast
slower
faster
slowest
fastest
以e结尾
加 -r/-st
nice
large
nicer
larger
nicest
largest
辅音+y结尾
变y为i加 -er/-est
happy
early
happier
earlier
happiest
earliest
重读闭音节
双写尾字母加 -er/-est
big
thin
bigger
thinner
biggest
thinnest
3. 教材例句:
· A train is slower than a plane.(教材原句,比较级+than)
· I am the youngest in my family.(教材原句,最高级前加the)
4. 核心结构:
· 比较级:A + be动词/实义动词 + 比较级 + than + B
· 最高级:主语 + be动词/实义动词 + the + 最高级 + 范围(in/of...)
5. 易错警示
· 最高级前面必须加the:❌ He is tallest in our class. ✅ He is the tallest in our class.
· than后面接比较对象:❌ A car is faster a bike. ✅ A car is faster than a bike.
二、语法点即时练习(每题附解析)
(一)单项选择题(5道)
1. A horse is ______ than a tortoise.
A. fast B. faster C. fastest D. the fastest
答案:B
解析:两者比较用比较级,fast的比较级是faster。
2. The cheetah is the ______ animal on land.
A. fast B. faster C. fastest D. the faster
答案:C
解析:三者以上比较用最高级,fast的最高级是fastest,前面已经有the。
3. This box is ______ than that one.
A. heavy B. heavier C. heaviest D. the heaviest
答案:B
解析:两者比较用比较级,heavy变y为i加er。
4. The elephant is the ______ animal on land.
A. big B. bigger C. biggest D. the bigger
答案:C
解析:三者以上比较用最高级,big双写g加est。
5. She runs ______ than me.
A. slow B. slower C. slowest D. the slowest
答案:B
解析:两者比较用比较级,slow的比较级是slower。
(二)用所给单词的适当形式填空(3道)
1. A car is ______ (fast) than a bike.
答案:faster
解析:两者比较用比较级,fast直接加er。
2. This is the ______ (big) apple in the basket.
答案:biggest
解析:三者以上比较用最高级,big双写g加est。
3. He is ______ (tall) than his brother.
答案:taller
解析:两者比较用比较级,tall直接加er。
Unit 4 单元语法专项练习
一、单项选择题(10道)
1. A plane is ______ than a train.
A. fast B. faster C. fastest D. the fastest
2. The snail is the ______ animal in the world.
A. slow B. slower C. slowest D. the slower
3. This book is ______ than that one.
A. interesting B. more interesting C. most interesting D. the most interesting
4. Tom is the ______ boy in our class.
A. tall B. taller C. tallest D. the taller
5. A stone is ______ than a feather.
A. heavy B. heavier C. heaviest D. the heaviest
6. This is the ______ day of the year.
A. hot B. hotter C. hottest D. the hotter
7. She sings ______ than me.
A. good B. better C. best D. the best
8. The yellow bag is ______ than the red one.
A. nice B. nicer C. nicest D. the nicest
9. This is the ______ film I have ever seen.
A. good B. better C. best D. the best
10. He runs ______ than his father.
A. quick B. quicker C. more quickly D. most quickly
二、用所给单词的适当形式填空(10道)
1. A cat is ______ (small) than a tiger.
2. This is the ______ (tall) building in the city.
3. She is ______ (happy) than before.
4. The sun is ______ (big) than the moon.
5. This is the ______ (good) book I have ever read.
6. He runs ______ (fast) than me.
7. This question is ______ (easy) than that one.
8. The blue pen is ______ (cheap) than the black one.
9. This is the ______ (bad) day of my life.
10. She dances ______ (well) than me.
三、句型转换(10道)
1. Tom is taller than John.(改为同义句)
John is ______ ______ Tom.
2. This book is more interesting than that one.(改为同义句)
That book is ______ ______ than this one.
3. He is the tallest boy in our class.(改为同义句)
He is taller than ______ ______ boy in our class.
4. A car is faster than a bike.(改为一般疑问句)
______ a car ______ than a bike?
5. This is the best film I have ever seen.(改为否定句)
This ______ the best film I have ever seen.
6. She runs faster than me.(对划线部分提问)
______ runs faster than you?
7. The elephant is bigger than the tiger.(对划线部分提问)
______ ______ is bigger than the tiger?
8. This is the most beautiful flower in the garden.(改为一般疑问句)
______ this the most beautiful flower in the garden?
9. He is heavier than his brother.(改为否定句)
He ______ ______ than his brother.
10. This is the cheapest shirt in the shop.(对划线部分提问)
______ ______ is the cheapest in the shop?
四、根据汉语提示完成句子(5道)
1. 火车比汽车慢。
A train is ______ ______ a car.
2. 飞机是最快的交通工具。
A plane is ______ ______ means of transport.
3. 这个箱子比那个重。
This box is ______ ______ that one.
4. 她是我们班最聪明的女孩。
She is ______ ______ girl in our class.
5. 他跑得比我快。
He runs ______ ______ me.
五、选词填空(每词限用一次)
faster, slower, bigger, smaller, tallest
1. A horse is ______ than a tortoise.
2. A snail is ______ than a rabbit.
3. The sun is ______ than the earth.
4. A cat is ______ than a lion.
5. He is the ______ boy in our school.
六、补全对话(选择最佳选项)
A: Which animal runs faster, a horse or a tortoise?
B: 1. ______
A: Which animal is the biggest on land?
B: 2. ______
A: 3. ______
B: The cheetah is the fastest animal on land.
A: Is the elephant bigger than the blue whale?
B: 4. ______ The blue whale is the biggest animal in the world.
A: 5. ______
B: You're welcome.
A. The elephant is the biggest on land.
B. A horse runs faster.
C. Which animal is the fastest on land?
D. No, it isn't.
E. Thank you for telling me.
七、完形填空
There are many things around us that move. Some things move fast, and some things move 1. ______.
A plane is the 2. ______ way to travel. It is faster than a train. A train is faster than a car. A car is faster than a bike.
A tortoise moves very 3. ______. It is slower than a snail. The snail is the 4. ______ animal in the world.
Some things are big, and some things are small. The sun is the 5. ______ thing in our solar system. The earth is 6. ______ than the sun. The moon is smaller than the earth.
We can use forces to make things move. A big force can make things move 7. ______. A small force can make things move 8. ______.
It is easier to move a 9. ______ thing than a heavy thing. It is harder to move a heavy thing than a light thing.
Forces are very 10. ______ in our daily lives. We use them every day.
1. A. fast B. slow C. slowly D. faster
2. A. fast B. faster C. fastest D. the faster
3. A. slow B. slowly C. slower D. slowest
4. A. slow B. slower C. slowest D. most slow
5. A. big B. bigger C. biggest D. most big
6. A. small B. smaller C. smallest D. most small
7. A. fast B. faster C. fastest D. most fast
8. A. slow B. slower C. slowest D. most slow
9. A. light B. heavy C. big D. small
10. A. important B. unimportant C. boring D. bad
Unit 4 专项练习答案与详解
一、单项选择题
1. B 解析:两者比较用比较级faster。
2. C 解析:三者以上比较用最高级slowest。
3. B 解析:interesting是多音节词,比较级用more interesting。
4. C 解析:三者以上比较用最高级tallest。
5. B 解析:两者比较用比较级heavier。
6. C 解析:三者以上比较用最高级hottest。
7. B 解析:good/well的比较级是better。
8. B 解析:两者比较用比较级nicer。
9. C 解析:三者以上比较用最高级best。
10. C 解析:quickly是多音节副词,比较级用more quickly。
二、用所给单词的适当形式填空
1. smaller 2. tallest 3. happier 4. bigger 5. best
6. faster 7. easier 8. cheaper 9. worst 10. better
三、句型转换
1. shorter than
2. less interesting
3. any other
4. Is; faster
5. isn't
6. Who
7. Which animal
8. Is
9. isn't heavier
10. Which shirt
四、根据汉语提示完成句子
1. slower than
2. the fastest
3. heavier than
4. the cleverest
5. faster than
五、选词填空
1. faster 2. slower 3. bigger 4. smaller 5. tallest
六、补全对话
1. B 2. A 3. C 4. D 5. E
七、完形填空
1. C 解析:修饰动词move用副词slowly。
2. C 解析:三者以上比较用最高级fastest。
3. B 解析:修饰动词move用副词slowly。
4. C 解析:三者以上比较用最高级slowest。
5. C 解析:三者以上比较用最高级biggest。
6. B 解析:两者比较用比较级smaller。
7. A 解析:大的力使物体移动得快,用fast。
8. B 解析:小的力使物体移动得更慢,用slower。
9. A 解析:移动轻的物体更容易,用light。
10. A 解析:力在我们的日常生活中很重要,用important。
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