Unit 2语法精讲精练Grammar Focus 动词不定式 -2024-2025学年人教版八年级英语下册

八年级英语下册Unit 2语法精讲精练 Grammar Focus: 动词不定式 (Infinitive) 一、知识点梳理 1. 动词不定式的基本结构 to + 动词原形（否定形式：not to do） 例：I want to help the old people. She decided not to go to the park. 2. 动词不定式的用法 (1) 作宾语 常见动词后接不定式作宾语： want, decide, hope, agree, plan, learn, need, offer, promise, try 例：They offered to clean up the park. He promised to come early. (2) 作宾语补足语 动词 + 宾语 + 不定式： ask/tell/want/teach/encourage/invite sb. to do sth. 例：The teacher asked us to read the book. My mother wants me to study hard. (3) 作目的状语 to do sth. 表示目的，可替换为 in order to do sth. 例：She came here to study English. (She came here in order to study English.) (4) 疑问词 + 不定式 疑问词 (what, how, when, where, which) + to do 例：I don’t know how to solve the problem. Can you tell me where to buy the tickets? (5) 不定式的复合结构 for sb. to do sth. 例：It’s important for us to protect the environment. 二、对应练习 单项选择 1.My sister plans ______ a volunteer at the hospital. A. to be B. being C. be D. is 2.The teacher told the students ______ loudly in the library. A. not talk B. don’t talk C. not to talk D. to not talk 3.I need ______ some books for the poor children. A. buy B. to buy C. buying D. bought 4.—Do you know ______ the problem? —Yes, I do. A. how solve B. how to solve C. what solve D. what to solve 5.It’s kind ______ you ______ help me. A. for; to B. of; to C. to; for D. to; of 用动词不定式填空 1.They decided __________ (clean) up the city park this weekend. 2.The girl hopes __________ (become) a doctor in the future. 3.My parents asked me __________ (not play) computer games too much. 4.It’s difficult __________ (learn) a foreign language well. 5.I don’t know where __________ (find) my lost keys. 句型转换 1.She went to the store because she wanted to buy some food. (改为同义句) She went to the store ______ ______ some food. 2.He needs to finish his homework first. (对划线部分提问) ______ does he need ______ ______? 3."Don’t forget to close the window," Mom said to me. (改为间接引语) Mom told me ______ ______ ______ to close the window. 改错题 1.I want you helping me with the housework. → __________________ 2.They plan visiting the old people’s home next week. → __________________ 3.It’s important of us to keep the classroom clean. → __________________ 翻译句子 1.他答应帮我学习数学。 2.学生们正在学习如何种树。 3.为了保护环境，我们应该减少使用塑料袋。 答案 单项选择 1.A 2. C 3. B 4. B 5. B 用动词不定式填空 1.to clean 2. to become 3. not to play 4.to learn 5. to find 句型转换 1.to buy 2. What; to do 3. not to forget 改错题 1.helping → to help 2.visiting → to visit 3.of → for 翻译句子 1.He promised to help me with my math. 2.The students are learning how to plant trees. 3.To protect the environment, we should use fewer plastic bags. 学科网（北京）股份有限公司 $$