寒假预习 Unit 1语法讲义+知识演练（讲义） -2025-2026学年人教PEP版英语四年级下册

寒假预习：专题02 Unit 1语法讲义+知识演练 2025-2026学年四年级下册英语（人教版） 核心语法点梳理 （一）祈使句（表达班级规则） 1. 否定式：Don't + 动词原形 + 其他.（表示“不要做某事”，课本核心规则表达） 课本例句：Don't be late.（不要迟到。） Don't eat in class.（不要在课堂上吃东西。） 2. 肯定式：动词原形开头 / Keep/Put + 名词 + 形容词/介词短语.（表示“做某事/保持某种状态”） 课本例句：Put up your hand.（举手。） Keep the classroom clean.（保持教室干净。） 3. 用法提示：祈使句无主语，多用于表达指令、规则、建议，语气直接，贴合班级场景。 （二）Can引导的请求许可及回答 1. 请求许可：Can I + 动词原形 + 其他?（表示“我能做某事吗？”，用于向他人寻求允许） 课本例句：Can I take this apple?（我能拿这个苹果吗？） 2. 肯定回答：Yes, you can.（是的，你可以。） 3. 否定回答：No, you can't.（不，你不可以。）+ 补充说明（贴合班级规则） 课本例句：— Can I run in class? （我能在课堂上跑吗？） — No, you can't. Don't run in class.（不可以，不要在课堂上跑。） （三）情态动词should表建议 1. 基本结构：主语 + should + 动词原形 + 其他.（表示“某人应该做某事”，用于提出合理建议，贴合值日、班级规则场景） 课本例句：We should keep our classroom clean.（我们应该保持教室干净。） You should turn off the lights.（你应该关掉灯。） 2. 否定式：主语 + should not（shouldn't） + 动词原形 + 其他.（表示“不应该做某事”） 例句：You shouldn't be loud in class.（你不应该在课堂上大声喧哗。） 3. 用法提示：should无人称变化，后面必须跟动词原形，语气委婉，适合表达班级行为建议。 知识演练 （一）按要求改写祈使句（每空一词） 1. Eat in class.（改为否定句） → ______ ______ in class. 2. Run in the hallway.（改为否定句） → ______ ______ in the hallway. 3. Put up your hand.（改为同义句，用Keep/Don't） → ______ ______ your hand down. 4. Keep the desk tidy.（改为否定句） → Don't make the desk ______. 5. Clean the blackboard.（改为否定句） → ______ ______ the blackboard. 6. Speak loudly in class.（改为否定句） → ______ ______ loudly in class. 7. Keep the window open.（改为否定句） → ______ keep the window open. 8. Put back the chairs.（改为否定句） → ______ ______ back the chairs. 9. Keep quiet.（改为同义句，用Don't） → ______ be ______. 10. Sweep the floor.（改为否定句） → ______ ______ the floor. （二）补全对话/改写句子（每空一词，含Can句型） 1. — ______ I open the window?（补全请求句） — Yes, you can. 2. — Can I take toys to school? — No, you ______. Don't take toys to school. 3. I can clean the blackboard.（改为一般疑问句） → ______ ______ clean the blackboard? 4. — Can I sit here? — ______, you can.（补全肯定回答） 5. She can sweep the floor.（改为否定句） → She ______ ______ the floor. 6. — Can I eat snacks in class? — No, you can't. ______ eat snacks in class.（补充规则） 7. They can put back the desks.（改为一般疑问句） → ______ they ______ back the desks? 8. — Can I speak now? — Yes, you can. ______ up your hand first.（补充建议） 9. I can't run in class.（改为请求句，用Can） → ______ I ______ in class? 10. — Can I help you clean the classroom? — Yes, you can. You can ______ the floor. （三）单项选择（选择最佳答案，将序号填在括号内） （ ）1. We ______ keep our classroom clean every day. A. should B. can C. don't （ ）2. — Don't be late for class! — ______, I won't. A. Thank you B. Sorry C. That's right （ ）3. You ______ run in the hallway. It's not safe. A. should B. shouldn't C. can （ ）4. — Can I put my bag on the teacher's desk? — ______. A. Yes, you can B. No, you can't C. Yes, I can （ ）5. We ______ turn off the lights when we leave the classroom. A. shouldn't B. can C. should （ ）6. — Can I clean the blackboard for you? — ______. A. No, you can't B. Yes, you can C. Thank you （ ）7. ______ be loud in class. Keep quiet. A. Don't B. Should C. Can （ ）8. My sister ______ sweep the floor. She helps me with it. A. should B. can't C. can （ ）9. We ______ eat in class. It's a class rule. A. don't B. shouldn't C. can （ ）10. — What should we do before class? — We ______ clean the desk. A. can B. shouldn't C. should 答案 （一）按要求改写祈使句 1. Don't eat 2. Don't run 3. Don't put 4. messy 5. Don't clean 6. Don't speak 7. Don't 8. Don't put 9. Don't; loud 10. Don't sweep （二）补全对话/改写句子 1. Can 2. can't 3. Can you 4. Yes 5. can't sweep 6. Don't 7. Can; put 8. Put 9. Can; run 10. sweep （三）单项选择 1. A 2. B 3. B 4. A 5. C 6. C 7. A 8. C 9. B 10. C ( 1 ) 学科网（北京）股份有限公司 $