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七年级上册Unit 4 My Favourite Subject语法总结
连词与时间介词
第一部分：连词
一、基本概念
连词用于连接单词、短语或句子，表达它们之间的逻辑关系。在Unit 4中，我们主要学习并列连词和从属连词。
并列连词
and (和，并且)
but (但是)
or (或者)
so (所以)
从属连词
because (因为)
when (当...时)
if (如果)
after (在...之后)
before (在...之前)
二、并列连词用法
连词 功能 示例
and 表示并列或递进 I like English and math. (我喜欢英语和数学)
He is tall and strong. (他又高又壮)
but 表示转折或对比 I like science, but I don't like history. (我喜欢科学，但不喜欢历史)
She is young but very smart. (她很年轻但很聪明)
or 表示选择或否定条件 Do you want tea or coffee (你想要茶还是咖啡 )
Hurry up, or you'll be late. (快点，否则你会迟到)
so 表示结果 It's raining, so we stay at home. (下雨了，所以我们待在家里)
I like music, so I join the music club. (我喜欢音乐，所以我加入了音乐俱乐部)
三、从属连词用法
连词 功能 示例
because 表示原因 I like PE because it's exciting. (我喜欢体育因为它很刺激)
He is happy because he gets good grades. (他很高兴因为他取得了好成绩)
when 表示时间 When I have math class, I feel happy. (当我有数学课时，我感到快乐)
I listen to music when I do my homework. (我做作业时听音乐)
if 表示条件 If it rains tomorrow, we won't have PE class. (如果明天下雨，我们就不上体育课)
I will be happy if you come to my party. (如果你来参加我的聚会，我会很高兴)
before 表示在...之前 I eat breakfast before I go to school. (我上学前吃早餐)
Please finish your homework before you watch TV. (看电视前请完成作业)
after 表示在...之后 After school, I play basketball. (放学后我打篮球)
I do my homework after I have dinner. (我晚饭后做作业)
连词使用注意事项：
并列连词连接两个对等的成分（词与词、短语与短语、句子与句子）
从属连词引导从句，需要与主句结合使用
because不能与so同时使用
（错误：Because I like it, so I study it. 正确：Because I like it, I study it. 或 I like it, so I study it.）
并列连词前通常有逗号，但从属连词引导的从句在前时用逗号，在后时不用
第二部分：时间介词
一、基本概念
时间介词用于表示动作发生的时间点或时间段。在Unit 4中，我们主要学习表示具体时间、日期、月份、季节等的时间介词。
at 7:00
具体时刻
on Monday
星期/日期
in July
月份/季节
in 2023
年份
in the morning
一天中的时段
二、常用时间介词
介词 用法 示例
at 具体时间点、节日、年龄 at 7:30 (在七点半)
at noon (在中午)
at Christmas (在圣诞节)
at the age of 12 (在12岁时)
on 日期、星期、具体某天 on Monday (在星期一)
on July 10th (在7月10日)
on my birthday (在我生日那天)
on weekend (在周末)
in 月份、季节、年份、世纪、长时段 in May (在五月)
in summer (在夏天)
in 2023 (在2023年)
in the morning (在早上)
from...to 表示时间范围 from Monday to Friday (从周一到周五)
from 8:00 to 10:00 (从8点到10点)
before 在...之前 before class (课前)
before 9 o'clock (9点前)
after 在...之后 after school (放学后)
after lunch (午饭后)
during 在...期间 during the holiday (假期期间)
during the class (上课期间)
三、时间介词使用规则
规则 说明 示例
at + 具体时刻 用于精确的时间点 at 6:00, at noon, at midnight
on + 具体日期 用于特定的日子 on Monday, on July 4th, on New Year's Day
in + 时间段 用于较长时间段 in May, in 2023, in the 21st century
不适用介词的情况 today, tomorrow, yesterday, this/next/last + 时间词 I have a test tomorrow.
We went to the museum last Sunday.
固定搭配 in the morning/afternoon/evening
at night I study in the morning.
He works at night.
时间介词常见错误：
混淆at/on/in：on 7:00 → at 7:00; in Monday → on Monday; at July → in July
this/next/last前不加介词：on this Monday → this Monday
at night是固定搭配，不能用in：in night → at night
morning/afternoon/evening前用in，但具体某天的上午/下午用on：in the morning vs. on Monday morning
三、综合练
练习1：选择正确的连词
1. I like English __________ it's interesting.
A. and B. but C. because D. so
2. She likes math, __________ she doesn't like history.
A. or B. but C. so D. because
3. __________ I finish my homework, I can watch TV.
A. After B. Before C. Because D. When
4. Do you want to play basketball __________ football
A. and B. but C. or D. so
5. It's raining, __________ we can't play outside.
A. because B. so C. but D. or
练习2：用正确的时间介词填空
1. We have a math test __________ Monday.
2. My birthday is __________ July 15th.
3. I usually get up __________ 6:30 __________ the morning.
4. We don't have school __________ summer.
5. Please come to my office __________ 3:00 __________ 4:00.
练习3：连词成句
1.like / I / because / interesting / it / science / is / .
__________________________________________________________
2.don't / I / or / like / history / geography / .
__________________________________________________________
3.school / after / play / I / basketball / .
__________________________________________________________
4.if / rain / it / we / tomorrow / won't / have / PE class / .
__________________________________________________________
class / before / eat / I / breakfast / .
__________________________________________________________
练习答案
练习1答案：
1. C 2. B 3. A 4. C 5. B
练习2答案：
1. on 2. on 3. at, in 4. in 5. from, to
练习3答案：
1. I like science because it is interesting.
2. I don't like history or geography.
3. I play basketball after school.
4. If it rains tomorrow, we won't have PE class.
5. I eat breakfast before class.

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