Unit 2 Keep Safe（易错题专项训练·语法提升）英语北京版四年级下册（新教材）

Unit 2 Keep Safe 专题02 语法提升·易错题专项训练 · 内容导航 · 1.祈使句的否定形式（Please don’t + 动词原形） 2.“It’s + 形容词 + to do”句型 3.“No + 动名词”标识表达 4. 综合练习 高频易错点、易错点提示、小练笔、答题点拨 易错精讲 祈使句的否定形式（Please don’t + 动词原形）高频易错点01 在本单元的学习中，我们一个重要语法：祈使句的否定形式（Please don’t + 动词原形）。现在我们一起系统的梳理下这个小学阶段重要的语法。 一、概念 祈使句是用来表达 “命令、请求、建议、禁止” 等语气的句子，主语通常是第二人称 “you”（你 / 你们），一般省略不写,祈使句的否定形式（以 “Please don’t + 动词原形” 为核心结构），主要用于礼貌地禁止或劝阻他人做某事，强调 “不要做某个动作”，语气委婉且明确，适合日常交流、安全提示等场景。 二、句型结构： 结构 例句 1. Please don’t + 动词原形 + 其他成分（宾语 / 状语等） Please don’t run down the stairs.（请不要跑楼梯。） 2. 变体结构（省略 Please，语气稍强） Don’t stop at the red light.（不要红灯时不停车。/ 红灯不能不停。） 易错点提示 否定祈使句需用“Please don’t + 动词原形”，易误加“be”或用动词三单形式。 经典例题 选择正确的句子： — ______ run down the stairs. It’s dangerous. A. Please don’t B. Please doesn’t C. Please not 点拨 答案：A 【解析】句意：不要跑下楼梯。很危险。否定祈使句用“Please don’t + 动词原形”，run是动词原形，故选A。 小练笔 01 一、根据提示补全否定祈使句。 1. Please don’t ______ (throw) things out of the window. 2. Please don’t ______ (stand) on the chair. 3. Please don’t ______ (run) down the stairs. 4. Please don’t ______ (push) in the crowd. 5. Please don’t ______ (skate) on thin ice. 二、判断句子正误，错误的请改正。 ( )6. Please don’t rides bikes fast in the street. ( )7. Please don’t stand on the desk. It’s not safe. ( )8. Please doesn’t throw the pencil. ( )9. Please don’t push others in the crowd. ( )10. Please not run in the cinema. “It’s + 形容词 + to do”句型高频易错点02 在本单元的学习中，出现了“It’s + 形容词 + to do”句型。现在我们一起系统的梳理下这个小学阶段重要的句型。 一、概念： “It’s + 形容词 + to do” 是小学阶段核心句型，用于表达 “做某事具有某种性质（如危险、安全、重要等）” ，核心功能是评价动作的特征或结果。 二、句型结构： 结构 例句 1. 基础结构（核心） It’s + 形容词（adj.） + to do sth.（动词不定式短语）. It’s dangerous to ride bikes fast in the street.（在街道上快速骑自行车是危险的。） 2. 否定结构（常用） It’s + not + 形容词 + to do sth. It’s not safe to stand on the chair.（站在椅子上是不安全的。） 易错点提示 该句型中“to”后接动词原形，易误接动名词或动词三单形式 经典例题 It’s dangerous ______ (swim) in the lake. 点拨 答案：to swim 【解析】句意：在湖里游泳是危险的。It’s + 形容词 + to do”句型中，to后接动词原形，故填to swim。 小练笔 02 一、用所给单词适当形式补全句子。 1. It’s not safe ______ (stand) on the chair. 2. It’s important ______ (stop) at the red light. 3. It’s dangerous ______ (ride) bikes fast in the street. 4. It’s safe ______ (walk) slowly on the stairs. 5. It’s good ______ (follow) safety rules. 二、选择正确的答案。 ( )6. It's good ______ early every morning. A. get up B. getting up C. to get up ( )7. It's bad ______ too much candy. A. eat B. to eat C. eating ( )3. It's polite ______ "Thank you". A. say B. to say C. saying ( )4. It's difficult ______ this new word. A. to spell B. spell C. spelling ( )5. It's exciting ______ a football match. A. watch B. to watch C. Watching No + 动名词” 禁止类标识表达高频易错点03 一、概念： “No + 动名词（动词 - ing 形式）” 是英语中公共标识、警示语的常用固定结构，用来简洁、明确地表示 “禁止做某事” 二、句型结构： 结构 例句 No + 动词 - ing 形式 No running. （禁止奔跑。） 易错点提示 No + 动词-ing 形式” 是公共标识里的常用结构，表示“禁止做某事”，注意动词必须使用-ing 形式，不能用原形 经典例题 The sign says "No ______". Don't swim in the lake. A. swim B. swimming C. swims 点拨 答案：B 【解析】句意：标牌上写着“禁止游泳”。请勿在湖中游泳。“No + 动名词” 是固定用法，所以 `swim` 要变成 `swimming`，选 B。 小练笔 03 用所给词的正确形式填空。 1. The sign says "No ______ (push)". Don't push in the crowd. 2. We can see "No ______ (skate)" near the lake. 3. "No ______ (eat) or drinking" means you can't eat here. 4. The park has a "No ______ (run)" sign. Please walk slowly. 5. "No ______ (talk)" in the cinema. Be quiet, please. 综合训练 一、单项选择。 ( ) 1. Please ______ stand on the chair. It's not safe. A. not B. don't C. isn't ( )2. You ______ ride fast on the street. It's dangerous. A. may B. should C. shouldn't ( )3. The sign says "No ______". Don't take photos here. A. photo B. photos C. taking photos ( )4. ______ careful! The stairs are wet. A. Be B. Is C. Are ( )5. He ______ stop at the red light. He runs into a taxi. A. doesn't B. don't C. isn't 二、从方框内选择合适的疑问词填空，每个词只能用一次。 don’t may No be slow 1. ______ pushing in the crowd. 2. Please ______ run down the stairs. 3. You ______ fall if you are not careful. 4. Walk ______ and keep to the right. 5. ______ careful! The ice is thin. 三、连词成句。 1．please, the, window, out, of, things, don’t, throw 2．dangerous, skate, thin, it’s, on, ice, to 3．red, stop, the, light, at, please 4．pushing, crowd, in, no, the 5．fast, ride, it’s, to, dangerous, bike, a 四、句型转换。 1. Please run down the stairs.（改为否定句） 2. You may skate here.（改为否定句） 3. The sign says "No swimming".（改为同义句） 4. He rides his bike fast.（改为否定句） 5. Stand on the chair.（改为否定祈使句） 五、情景交际。选出合适的句子补全对话。 A. Please don't run. B. Let's walk slowly. C. Don't swim in the lake. D. I won't swim there. E. Let's run to the lake! Sara: Hi, Tom! Let's go to the park. Tom: Great! 1. ______ Sara: 2. ______ Look at the sign: "No running". Tom: Oh, right. 3. ______ Sara: And 4. ______ The lake is deep. Tom: OK. 5. ______ 六、阅读绘本，选择正确的描述。 One little monkey rides his bike in the street. He rides very fast. He doesn’t look at the traffic lights. When he sees a red light, he doesn’t stop. He runs into a yellow taxi. He falls off his bike. The taxi driver asks, “Are you all right?” The little monkey says, “I’m OK. I’m sorry.” The driver says, “You should stop at the red light! It’s dangerous to ride so fast.” ( )1. What does the little monkey do in the street? A. He runs fast. B. He rides a bike fast. C. He plays football. ( )2. Does he stop at the red light? A. Yes, he does. B. No, he doesn’t. C. We don’t know. ( )3. What happens to him? A. He runs into a taxi. B. He falls off his bike. C. Both A and B. ( )4. What does the taxi driver say? A. “You’re great!” B. “You should stop at the red light!” C. “You can ride fast.” ( )5. Why is it dangerous to ride fast? A. You may run into cars. B. You may fall off the bike. C. Both A and B. 七、阅读短文，完成相应的任务。 Safety at School At school, we have many safety rules. Please don’t throw things out of the window. It’s dangerous for the students below. Please don’t stand on the chair. You may fall and get hurt. When you go down the stairs, please don’t run. Walk slowly and keep to the right. Also, no pushing in the classroom. We should all follow the rules to stay safe. 任务1：判断正(T)误(F) ( )1. We can throw things out of the window at school. ( )2. Standing on the chair is safe. ( )3. We should walk slowly down the stairs. ( )4. We can push in the classroom. ( )5. Following safety rules helps us stay safe. 任务2：回答问题 6. What should we do when we go down the stairs? 7. Why can’t we stand on the chair? 参考答案 小练笔 01 1. throw 2. stand 3. run 4. push 5. skate 6. 错误 → Please don’t ride bikes fast in the street. 7. 正确 8. 错误 → Please don’t throw the pencil. 9. 正确 10. 错误 → Please don’t run in the cinema. 小练笔 02 1. to stand 2. to stop 3. to ride 4. to walk 5. to follow 6. C 7. B 8. B 9. A 10. B 小练笔 03 1. pushing 2. skating 3. eating 4. running 5. talking 综合训练 一、单项选择。 1．B 2．C 3．B 4．A 5．A 二、从方框内选择合适的疑问词填空，每个词只能用一次。 1. No 2. don’t 3. may 4. slow 5. Be 三、连词成句。 1. Please don’t throw things out of the window. 2. It’s dangerous to skate on thin ice. 3. Please stop at the red light. 4. No pushing in the crowd. 5. It’s dangerous to ride a bike fast. 四、句型转换。 1. Please don’t run down the stairs. 2. You may not skate here. 3. Please don’t swim here. / Don’t swim here. 4. He doesn’t ride his bike fast. 5. Don’t stand on the chair. 五、情景交际。选出合适的句子补全对话。 1．E 2．A 3．B 4．C 5．D 六、阅读绘本，选择正确的描述。 1．B 2．B 3．C 4．B 5．C 七、阅读短文，完成相应的任务。 任务1 1. F 2. F 3. T 4. F 5. T 任务2 6. We should walk slowly and keep to the right. 7. Because we may fall and get hurt. 第 1 页 共 18 页 学科网（北京）股份有限公司 $