Unit 1语法(否定前缀&need用法)培优讲义 2025-2026学年仁爱科普版（2024）八年级英语上册

仁爱八上Unit 1语法(否定前缀&need用法)培优讲义

一、否定前缀及含义

否定前缀通常表达原词的相反意义。常用的否定前缀有：

non-	He became a non-smoker in order to keep healthy.	“non-” 加在 “smoker（吸烟者）” 前，表 “非吸烟者”，与 “smoker” 意义相反。
dis-	Sea food may seem to disagree with some people.	“dis-” 加在 “agree（同意；适合）” 前，表 “（食物等）不适合”，与 “agree”（此处取 “适合” 义）意义相反。
un-	Hamburgers may taste delicious, but it is unhealthy to eat too many of them.	“un-” 加在 “healthy（健康的）” 前，表 “不健康的”，与 “healthy” 意义相反。
in-	It is incorrect to do sports with an empty stomach.	“in-” 加在 “correct（正确的）” 前，表 “不正确的”，与 “correct” 意义相反。

练习巩固

（一）用所给单词的正确形式填空

dislike、uncomfortable、impossible、nonstop、misplace

1.It is _____________________ to keep healthy without good living habits.

2.Don't eat too much junk food, or you will feel _____________________.

3.She _____________________ ice cream because it's bad for her teeth.

4.My sister's room is tidy, and she never ________________ her things.

5.We felt very tired after a long and _____________________ walk.

（二）选词填空

impatient   nonsense    uncomfortable     improper

A(n) 1.__________________ habit does a lot of harm to people. For example, staying up late is very bad for people's health. Clearly, they will feel sleepy and 2.__________________ the next day. What's worse, people will become 3.__________________ and they may even forget important dates. Sometimes, they will speak 4.__________________ because their minds are not clear. To get rid of the habit, people need to sleep early and do some sports. A healthy body and a clear mind will make them feel good all day.

（三）根据词根含义，写出下列单词的反义词

1.happy → _____________________

2.able → _____________________

3.understand → _____________________

4.appear → _____________________

5.proper → _____________________

（四）单句语法填空

1.It's ________________________ (possible) to finish such a difficult task in only one hour.

2.He felt ________________________ (comfortable) after eating too much junk food.

3.Many people ________________________ (like) the idea of working overtime without extra pay.

4.The little boy was so ________________________ (patient) that he couldn't wait for his turn.

5.It's ________________________ (correct) to copy others' homework.

6.His explanation is ________________________ (sense), and we still don't understand the problem.

7.The man was ________________________ (able) to walk after the accident.

8.I think it's ________________________ (polite) to cut in line when waiting.

9.Some students ________________________ (spell) words wrongly in the exam.

10.The ________________________ (stop) rain has caused serious floods in some areas.

答案

（一）

1.impossible

2.uncomfortable

3.dislikes

4.misplaces

5.nonstop

（二）

1.improper

2.uncomfortable

3.impatient

4.nonsense

（三）

1.unhappy

2.unable

3.misunderstand

4.disappear

5.improper

（四）

1.impossible