Unit4 Grammar 时间介词和频率副词 讲义2025-2026学年译林版（2024）英语七年级上册

本讲义聚焦七年级上册英语时间介词（in, on, at）和频率副词核心知识点，系统梳理时间介词“从大到小”用法（in表年/月/季节等较长时间段，on表具体某天，at表具体时间点）及频率副词含义、程度（always至never）与句中位置规律（实义动词前，be动词等后），构建描述日常活动的语言学习支架。 资料以“知识点详解+分层练习”为特色，通过总结表格对比辨析介词用法、例句解析明晰副词位置，培养思维品质与语言能力。课中辅助教师搭建清晰教学框架，课后学生可借助单选、句型转换等练习及参考答案自主巩固，有效查漏补缺，提升英语表达准确性。

七年级上册译林版英语讲义：Unit 4 Grammar (时间介词和频率副词) 7A Unit 4 Grammar — 时间介词和频率副词 学习目标 1. 掌握常用的时间介词 (in, on, at) 的用法，并能正确区分它们在不同时间表达中的应用。 1. 掌握频率副词 (always, usually, often, sometimes, seldom, never) 的含义和在句中的位置。 1. 能够正确运用时间介词和频率副词描述日常活动和习惯。 1. 通过练习，巩固时间介词和频率副词的用法，提高英语表达的准确性和地道性。 知识点详解 在英语中，时间介词和频率副词是描述时间点、时间段以及动作发生频率的重要词类。它们能够帮助我们更精确地表达日常活动和习惯。 一、时间介词 (Prepositions of Time): in, on, at 时间介词 in, on, at 是英语中最常用的三个介词，它们在表示时间时有各自特定的用法，通常遵循“从大到小”的原则。 1. in (表示较长的时间段) · 用法： 用于表示年、月、季节、世纪、泛指的上午/下午/晚上，以及一段时间之后。 · 例句： · in 2025 (在2025年) · in January (在一月) · in spring / summer / autumn / winter (在春天/夏天/秋天/冬天) · in the 21st century (在21世纪) · in the morning / afternoon / evening (在上午/下午/晚上) · I will finish my homework in an hour. (我将在一个小时内完成作业。) · 注意： 当 morning/afternoon/evening 前有修饰词时，通常用 on，如 on a cold morning。 1. on (表示具体的某一天或某一天的上午/下午/晚上) · 用法： 用于表示具体的某一天、某日期的上午/下午/晚上、星期几、特定节日等。 · 例句： · on Monday (在星期一) · on October 1st (在十月一日) · on my birthday (在我的生日) · on Christmas Day (在圣诞节) · on a sunny afternoon (在一个阳光明媚的下午) 1. at (表示具体的时间点) · 用法： 用于表示具体的时间点、黎明/中午/午夜、特定节日（不带Day）等。 · 例句： · at 7 o’clock (在7点钟) · at noon / midnight (在中午/午夜) · at night (在晚上) · at Christmas (在圣诞节期间) · at the moment (此刻) 总结表格： 介词 用法 例句 in 年、月、季节、世纪、泛指的上午/下午/晚上、一段时间之后 in 2025, in July, in summer, in the morning, in an hour on 具体的某一天、某日期的上午/下午/晚上、星期几、特定节日 on Monday, on October 1st, on Christmas Day at 具体的时间点、黎明/中午/午夜、特定节日（不带Day） at 7 o’clock, at noon, at night, at Christmas 二、频率副词 (Adverbs of Frequency) 频率副词用来表示动作发生的频繁程度。它们在句中的位置相对固定，通常位于实义动词之前，be动词、情态动词和助动词之后。 1. 常用频率副词及其程度： · always (总是，100%) · usually (通常，90%) · often (经常，70%) · sometimes (有时，50%) · seldom / rarely (很少，10%) · never (从不，0%) 1. 频率副词在句中的位置： · 位于实义动词之前： · 例：I always get up early. (我总是早起。) · She often helps her mother. (她经常帮助她妈妈。) · 位于be动词、情态动词、助动词之后： · 例：He is always late. (他总是迟到。) · You can never finish it. (你永远也完不成。) · I don’t often go to the cinema. (我不太常去看电影。) · sometimes 可以位于句首、句中或句末： · 例：Sometimes, I read books. / I sometimes read books. / I read books sometimes. 例句解析： * My father usually reads newspapers in the morning. (我爸爸通常在早上看报纸。) - usually 位于实义动词 reads 之前。 * She is never late for school. (她上学从不迟到。) - never 位于be动词 is 之后。 * We don’t often go out on weekdays. (我们工作日不常外出。) - often 位于助动词 don't 之后。 练习与巩固 一、单项选择 (选择最佳答案填空) 1. My birthday is ______ October 20th. A. in B. on C. at D. for 1. We usually have dinner ______ 6:30 p.m. A. in B. on C. at D. for 1. I like to read books ______ the evening. A. in B. on C. at D. for 1. They play football ______ Sundays. A. in B. on C. at D. for 1. The school year starts ______ September. A. in B. on C. at D. for 1. He ______ goes to bed late, so he is always tired. A. never B. seldom C. often D. sometimes 1. My mother ______ cooks dinner for us. She is a great cook. A. never B. seldom C. sometimes D. always 1. We ______ watch TV on weekdays because we have too much homework. A. always B. usually C. often D. seldom 1. —Do you ______ go to the library? —Yes, I go there once a week. A. always B. usually C. often D. never 1. It ______ rains in the desert. It’s very dry there. A. always B. usually C. often D. seldom 二、用适当的时间介词 (in, on, at) 或频率副词填空 1. My father ______ (always/sometimes) gets up early. 1. The train leaves ______ (at/on) 8:00 a.m. 1. We have a long holiday ______ (in/on) summer. 1. She ______ (never/often) eats breakfast, so she is hungry. 1. I like to go swimming ______ (in/on) Sunday mornings. 1. They play basketball ______ (at/in) the afternoon. 1. He ______ (usually/seldom) goes to the cinema, maybe once a year. 1. The meeting is ______ (on/at) December 25th. 1. What do you do ______ (in/at) night? 1. My sister ______ (sometimes/always) helps me with my homework. 三、句型转换 (按要求转换句型) 1. He often plays computer games. (改为否定句) ____________________________________ 1. They go to school by bike on weekdays. (对划线部分提问) ____________________________________ 1. I usually get up at six. (改为一般疑问句) ____________________________________ 1. She is never late for class. (改为肯定句) ____________________________________ 1. My parents watch TV in the evening. (用sometimes改写句子，并放在句首) ____________________________________ 参考答案 一、单项选择 1. B 2. C 3. A 4. B 5. A 6. C 7. D 8. D 9. C 10. D 二、用适当的时间介词 (in, on, at) 或频率副词填空 1. always 2. at 3. in 4. never 5. on 6. in 7. seldom 8. on 9. at 10. sometimes 三、句型转换 1. He doesn’t often play computer games. / He often doesn’t play computer games. 2. How do they go to school on weekdays? 3. Do you usually get up at six? 4. She is always on time for class. / She is always early for class. (根据语境调整) 5. Sometimes, my parents watch TV in the evening. 学科网（北京）股份有限公司 $