Unit 4 Safety first 核心语法精讲精练（专项训练）-2026-2027学年译林版（三起）英语五年级上册

译林版英语五年级上册 Unit 4 Safety first 核心语法精讲精练

 

第一部分：核心语法梳理

本单元围绕“安全第一”主题展开，核心语法是情态动词 should 和 shouldn't 的用法，用于表达建议、责任和义务。

核心语法：情态动词 should / shouldn't

基本用法

should 是情态动词，意为“应该”，用于表示建议、责任或义务。shouldn't 是 should not 的缩写形式，意为“不应该”，用于表示劝阻或禁止。

句型结构

肯定句：主语 + should + 动词原形 + 其他.

-We should walk slowly inside the classroom. 我们应该在教室里慢慢走。

- You should warm up before PE class. 你应该在体育课前热身。

否定句：主语 + shouldn't + 动词原形 + 其他.

- We shouldn't run on the stairs. 我们不应该在楼梯上跑。

-You shouldn't push others in the classroom. 你不应该在教室里推别人。

一般疑问句：Should + 主语 + 动词原形 + 其他?

- Should we listen to teachers carefully? 我们应该认真听老师的话吗？

- 肯定回答：Yes, 主语 + should.

- 否定回答：No, 主语 + shouldn't.

用法要点

should 是情态动词，后接动词原形，没有人称和数的变化。

should 的否定形式是 shouldn't = should not。

shouldn't 后同样接动词原形。

should 的语气比 must（必须）要弱，更侧重于“建议”而非“强制”。

第二部分：对应练习

练习一：用 should 或 shouldn't 填空（10分）

1. We __________ warm up before sports.

2. You __________ run on the stairs. It's dangerous.

3. She __________ help her classmates when they fall down.

4. They __________ throw rubbish everywhere.

5. We __________ speak politely to teachers and classmates.

6. He __________ play with sharp things.

7. You __________ finish your homework on time.

8. We __________ cut in line.

9. They __________ listen to teachers carefully in class.

10. I __________ go to bed early on school nights.

练习二：单项选择（10分）

(   ) 1. We ______ walk slowly inside the classroom.

    A. should    B. shouldn't    C. are

(   ) 2. You ______ run or chase each other on the stairs.

    A. should    B. shouldn't    C. can

(   ) 3. —Should I warm up before PE class? —Yes, you ______.

    A. should    B. shouldn't    C. are

(   ) 4. They ______ pull their classmates' clothes when they run.

    A. should    B. shouldn't    C. must

(   ) 5. She ______ sit down at once after running.

    A. should    B. shouldn't    C. shoulds

(   ) 6. We ______ keep our classroom tidy and clean.

    A. should    B. shouldn't    C. shouldn't to

(   ) 7. —______ we help our classmates? —Yes, we should.

    A. Are    B. Do    C. Should

(   ) 8. You ______ eat snacks in class.

    A. should    B. shouldn't    C. should not to

(   ) 9. They ______ push others in the classroom.

    A. should    B. should to    C. shouldn't

(   ) 10. We ______ line up when going out.

    A. should    B. shouldn't    C. shoulds

练习三：根据中文补全句子（10分）

1. 我们应该在体育课前热身。

   We __________ __________ up before PE class.

2. 你不应该在楼梯上跑。

   You __________ __________ on the stairs.