Unit 5语法讲义-2025-2026学年外研版英语八年级下册

八年级英语下册Unit5语法讲义 宾语从句（1） 一、宾语从句的定义 在句子中作宾语的从句，叫做宾语从句。它位于动词、介词等后面，用来表达一个完整的意思。 · 简单句宾语：由单词 / 短语充当（如 I know **him**）。 · 宾语从句：由完整句子充当（如 I know **that he went to see a film yesterday**）。 二、that 引导的宾语从句 1. 核心用法 当谓语动词表示肯定概念（如 hope, believe, know, say, think 等）时，后面的句子一般用 that 引导。 · that 无实际词义，只起语法功能，多数情况下可以省略。 2. 基本结构（挖空填写） 1. 主句（主语 + 谓语动词）+ that + 从句（主语 + 谓语 + 其他） 2. 例句： 1. I hope (that) it will snow this winter. 1. Betty thinks (that) trees can improve the air. 注意：并非所有动词后都可接 that 引导的宾语从句，常见动词有：believe, expect, explain, feel, hear, hope, imagine, prefer, promise, report, say, see, tell, think, understand, warn, wish 等。 三、whether /if 引导的宾语从句 1. 核心用法 当表达 “是否” 的不确定概念时，用 whether 或 if 引导，不能用 that。 2. 基本结构（挖空填写） 1. 主句（主语 + 谓语动词）+ whether / if + 从句（主语 + 谓语 + 其他） 2. 例句： · He does not know whether they will plant trees on Saturday or not. · He asks whether / if we will go fishing on Sunday. 3. whether 与 if 的选择 · 从句中有 or not 时，一般用 whether，构成 whether... or not。 · 从句中没有 or not 时，两者通常都可以使用。 四、配套练习 （一）基础填空 1. I believe __________ we will have a good time. (that / if) 2. She doesn’t know __________ he will come or not. (whether / that) 3. I think __________ you are right. (that / whether) 4. He asks __________ we can finish the work on time. (if / that) 5. They hope __________ it will be sunny tomorrow. (that / whether) （二）句型转换 1. I know. He is a good student.（合并为宾语从句）I know __________ he is a good student. 2. Do you know? Will they come to the party?（合并为宾语从句）Do you know __________ they will come to the party? 3. I think. He can pass the exam.（合并为宾语从句）I think __________ he can pass the exam. 4. He doesn’t know. Is she at home?（合并为宾语从句）He doesn’t know __________ she is at home. （三）情景选择 1. 当你想表达 “我希望明天会下雨” 时，应说：A. I hope that it will rain tomorrow.B. I hope if it will rain tomorrow. 2. 当你想表达 “我不知道他是否会来” 时，应说：A. I don’t know that he will come.B. I don’t know whether he will come or not. 五、参考答案 （一）基础填空 1. that 2. whether 3. that 4. if / whether 5. that （二）句型转换 1. that 2. if / whether 3. that 4. if / whether （三）情景选择 1. A 2. B 宾语从句（1）课堂小测 （时间：15 分钟 满分：30 分） 一、单项选择（每题 2 分，共 10 分） 1. I believe ______ we will win the game.A. that B. if C. whether 2. She doesn’t know ______ he will come back or not.A. that B. whether C. if 3. Do you know ______ they will visit the museum tomorrow?A. that B. if C. what 4. I think ______ you should listen to the teacher carefully.A. that B. whether C. if 5. He asks ______ we can finish the work before 5 o’clock.A. that B. if C. what 二、用 that /if/whether 填空（每题 2 分，共 10 分） 1. I hope __________ it will be sunny this weekend. 2. He doesn’t know __________ she is at home now. 3. They want to know __________ we will have a party or not. 4. She says __________ she likes reading very much. 5. Do you think __________ he can pass the exam? 三、句型转换（每题 2 分，共 10 分） 1. I know. He is from America.（合并为宾语从句）I know __________ he is from America. 2. Do you know? Will they go to the zoo?（合并为宾语从句）Do you know __________ they will go to the zoo? 3. I think. He can swim very well.（合并为宾语从句）I think __________ he can swim very well. 4. He doesn’t know. Is the girl his sister?（合并为宾语从句）He doesn’t know __________ the girl is his sister. 5. We believe. They will come back soon.（合并为宾语从句）We believe __________ they will come back soon. 参考答案 一、单项选择 1. A 2. B 3. B 4. A 5. B 二、用 that /if/whether 填空 1. that 2. if / whether 3. whether 4. that 5. that 三、句型转换 1. that 2. if / whether 3. that 4. if / whether 5. that 学科网（北京）股份有限公司 $