Unit 3 lesson5 2025-2026学年仁爱科普版英语八年级上册-课时练习
语法项目一：否定前缀non-、 dis-、 un-、 mis-、 in- 和 im-
【语法探究】
否定前缀通过改变单词的语义来表示相反含义。否定前缀 non-、dis-、un-、mis-、in-、im- 需依附于词根，表达______含义。
1.non-常加在名词前，表示“非；不”，如 nonstop、_______________
(非吸烟者)。
2.dis-多加在动词、形容词前，表示“相反动作；否定”，如 disagree、___________(不诚实的)。
3.un-用于形容词、动词前，表示“不；相反”，如__________(不高兴的)、unlock(揭开)。
4.im-接以b/m/p 开头的形容词，表示“不”，如 impossible、__________(不礼貌的)。
5.mis-常和动词结合，表示“错误地；不当”，如 misunderstand、__________(误导)。
6.in-加在形容词前，表示“不”，如 incorrect、________(不活跃的)。
【语法专练】
一、用所给词的适当形式填空
1.The _________(stop) rain caused flooding(洪水) in some areas last night.
2.She always ________________(understand) my tries to stay positive and makes me sad.
3.This diet plan is __________(proper). It only has junk food and we can’t follow it to stay healthy.
4.They _________(agree) on how to keep healthy. They need more discussion(讨论).
5.She felt tired all day because of her ___________(healthy) lifestyle.
二、选择填空
( )1.Which of the following words is formed in the same way as “impolite”？
A.blackboard B.uncertain C.earthquake
( )2.Which of the following words can be added with a prefix “im-”？
A.patient B.honest C.fair
( )3.After the long winter， the bear stayed in its cave and hardly moved. It was probably during those cold months.
A.incorrect B.impolite C.inactive
三、用否定前缀改写句子，保持句意不变
1.He is not happy with his new job.
→He is __________ with his new job.
2.It is not possible to finish the work in one hour.
→It is ___________ to finish the work in one hour.
3.He took the wrong book by accident.
→He _________ the book by accident.
语法项目二：need to do/don’t need to do/needn’t do
【语法探究】
need to do/don’t need to do/needn’t do的区别
结构 含义及用法
need to do 实义动词，表示 “必须做某事”(强调客观需求)。 如：I need to study hard. 我必须努力学习。
don’t need to do _______动词否定，含义同 needn’t do，但更强调 “没有必要”。 如：We don’t need to hurry. 我们没必要赶时间。
needn’t do ______动词否定，表示 “不必做某事”(已有足够条件，无需做)。 如：You needn’t buy gifts. 你不必买礼物。
【语法专练】
一、用need的适当形式填空
1.We ______ ____ exercise often for a sound(健康的) body.
2.She ________ ______ ____ stay up late. It’s bad for her mind.
3.You _________ worry about small things. Keep a sound mind！
4.______ he _____ ____ eat vegetables for health？
—Yes， he does. /No， he ________ ______ _____.
5.—Need I drink eight glasses of water daily？
—No， you _________. Just drink when thirsty.
二、选择填空
( )1.Tom to go far if he some help. Our house is next to his.
A.doesn’t need； need
B.needn’t； needs
C.doesn’t need； needs
( )2.To stay healthy， we drink enough water every day. It’s good for our bodies.
A.need to B.don’t need to C.needn’t
( )3.For a sound body and mind， we force ourselves to be perfect. In this way， we’ll be happier.
A.need to B.don’t need C.needn’t
三、短文填空
For 1 healthy body， kids need 2 (do) sports regularly. They can run， swim 3 play ball games. But they 4 (not need) to do very hard exercise. For a sound mind， they should read 5 ,
(interest) books. They need to find time 6 (relax) every day. Some students spend too much time 7 their phones. However， they needn’t
8 (do) so. It’s important to keep a balance(均衡).(共14张PPT)
语法项目一：否定前缀non-、 dis-、 un-、 mis-、 in- 和 im-
【语法探究】
否定前缀通过改变单词的语义来表示相反含义。否定前缀 non-、dis-、un-、mis-、in-、im- 需依附于词根，表达______含义。
1.non-常加在名词前，表示“非；不”，如 nonstop、_______________
(非吸烟者)。
2.dis-多加在动词、形容词前，表示“相反动作；否定”，如 disagree、___________(不诚实的)。
否定
non-smoker
dishonest
3.un-用于形容词、动词前，表示“不；相反”，如__________(不高兴的)、unlock(揭开)。
4.im-接以b/m/p 开头的形容词，表示“不”，如 impossible、__________(不礼貌的)。
5.mis-常和动词结合，表示“错误地；不当”，如 misunderstand、__________(误导)。
6.in-加在形容词前，表示“不”，如 incorrect、________(不活跃的)。
unhappy
impolite
mislead
inactive
【语法专练】
一、用所给词的适当形式填空
1.The _________(stop) rain caused flooding(洪水) in some areas last night.
2.She always ________________(understand) my tries to stay positive and makes me sad.
3.This diet plan is __________(proper). It only has junk food and we can’t follow it to stay healthy.
nonstop
misunderstands
improper
4.They _________(agree) on how to keep healthy. They need more discussion(讨论).
5.She felt tired all day because of her ___________(healthy) lifestyle.
disagree
unhealthy
二、选择填空
( )1.Which of the following words is formed in the same way as “impolite”？
A.blackboard B.uncertain C.earthquake
B
( )2.Which of the following words can be added with a prefix “im-”？
A.patient B.honest C.fair
( )3.After the long winter， the bear stayed in its cave and hardly moved. It was probably during those cold months.
A.incorrect B.impolite C.inactive
A
C
三、用否定前缀改写句子，保持句意不变
1.He is not happy with his new job.
→He is __________ with his new job.
2.It is not possible to finish the work in one hour.
→It is ___________ to finish the work in one hour.
3.He took the wrong book by accident.
→He _________ the book by accident.
unhappy
impossible
mistook
语法项目二：need to do/don’t need to do/needn’t do
【语法探究】
need to do/don’t need to do/needn’t do的区别
结构 含义及用法
need to do 实义动词，表示 “必须做某事”(强调客观需求)。
如：I need to study hard. 我必须努力学习。
结构 含义及用法
don’t need to do _______动词否定，含义同 needn’t do，但更强调 “没有必要”。
如：We don’t need to hurry. 我们没必要赶时间。
needn’t do ______动词否定，表示 “不必做某事”(已有足够条件，无需做)。
如：You needn’t buy gifts. 你不必买礼物。
实义
情态
【语法专练】
一、用need的适当形式填空
1.We ______ ____ exercise often for a sound(健康的) body.
2.She ________ ______ ____ stay up late. It’s bad for her mind.
3.You _________ worry about small things. Keep a sound mind！
need to
doesn’t need to
needn’t
4.______ he _____ ____ eat vegetables for health？
—Yes， he does. /No， he ________ ______ _____.
5.—Need I drink eight glasses of water daily？
—No， you _________. Just drink when thirsty.
Does
need to
doesn’t need to
needn’t
二、选择填空
( )1.Tom to go far if he some help. Our house is next to his.
A.doesn’t need； need
B.needn’t； needs
C.doesn’t need； needs
C
( )2.To stay healthy， we drink enough water every day. It’s good for our bodies.
A.need to B.don’t need to C.needn’t
( )3.For a sound body and mind， we force ourselves to be perfect. In this way， we’ll be happier.
A.need to B.don’t need C.needn’t
A
C
三、短文填空
For 1 healthy body， kids need 2 (do) sports regularly. They can run， swim 3 play ball games. But they 4 (not need) to do very hard exercise. For a sound mind， they should read 5 ,
(interest) books. They need to find time 6 (relax) every day. Some students spend too much time 7 their phones. However， they needn’t
8 (do) so. It’s important to keep a balance(均衡).
a
to do
and
don’t need
interesting
to relax
on
do
