内容正文:
九年级上册Unit 1 Grammar
《条件状语从句与原因状语从句》导学案
班级:________ 姓名:________ 得分:________
一、学习目标
· 掌握状语从句两种基本语序,能正确使用逗号分隔从句与主句;
· 熟练掌握 if 引导条件状语从句的两类结构:if + 一般现在时 + 祈使句、主将从现(主句含 will/may);
· 辨析 because 与 since 引导原因状语从句的用法,掌握 “because 不与 so 连用” 核心易错点;
· 能结合语境选用正确引导词,完成单选、词形填空、英汉互译三类题型。
二、课前基础铺垫:状语从句概念
状语从句是由引导词连接的完整分句,用于补充说明主句动作发生的条件或原因,存在两种语序结构:
结构 1:引导词 + 从句,主句(从句前置,加逗号)
例句:If you feel tired, take a rest.
结构 2:主句 + 引导词 + 从句(从句后置,不加逗号)
例句:Take a rest if you feel tired.
思考:两个句子语义相同,标点使用有何区别?
模块一 if 引导条件状语从句
→考点 1 If + 一般现在时,主句为祈使句(表建议、劝告)
【教材原文例句】
If you want to know more about it, call now.
如果你想了解更多情况,现在就打电话吧。
If you want to know what to see, look at the guide.
如果你想知道有什么可看的,就读一下指南吧。
If you do not feel well, please go to see the doctor.
如果你感觉不舒服,就请去看医生吧。
语序转换练习
原句:If you ever go to London, make sure you visit the Science Museum.
从句后置改写:________________________________________
基础分层练习
单项选择
(1) ______ you need help, ask me for help.
A. Because B. If C. Since
(2) Stop running ______ you feel tired.
A. if B. so C. but
用所给词适当形式填空
(1) If you ______ (forget) the word, ______ (look) it up in the dictionary.
(2) If it ______ (rain) tomorrow, ______ (take) your umbrella with you.
汉译英
(1) 如果你有问题,现在就举手吧。_______________________________________
(2) 如果你想去参观博物馆,提前预约吧。________________________________
→考点 2 If + 一般现在时,主句用 will/may(主将从现,表将来假设)
核心语法规则(必背)
if 从句统一使用一般现在时;主句表达将来动作可使用 will(将会)或情态动词 may(可以、可能)。
【教材原文例句】
If it rains, we’ll stay at home. 如果下雨,我们就待在家里。
If you start doing your homework now, you’ll finish it before dinner.
如果你现在开始做作业,晚饭前就能做完。
If you do all these other things instead of your homework, you won’t have time to study.
如果你只顾做别的事不写作业,就没时间学习。
If I start doing my homework after dinner, I’ll finish it before I go to bed.
晚饭后写作业,睡前就能完成。
She may come with us if she arrives in time.
如果她来得及时,就能和我们一起去。
巩固分层练习
单项选择
(1) If you ______ harder, you ______ better grades.
A. work; will get B. will work; get C. work; get
(2) We ______ go shopping if we finish our work early.
A. may B. will be C. are
(3) If it ______ fine this weekend, we won’t stay inside.
A. won’t be B. isn’t C. is
词形填空
(1) If he ______ (come) on time, we ______ (start) the meeting soon.
(2) You ______ (miss) the bus if you ______ (not hurry) up.
(3) If Lily ______ (arrive) early, she may help us clean the room.
中英互译
(1) If you don’t exercise, you won’t keep healthy._____________________________
(2) 如果明天不下雪,我们可以去公园散步。_______________________________
!!! if 从句易错点总结
时态红线:if 条件从句不能使用 will;错误:If it will rain;正确:If it rains
标点规则:从句置于句首,必须加逗号;从句放句末无需逗号
词义拓展:if 有两层含义,表 “如果” 遵循主将从现;宾语从句中表 “是否”,无时态限制
模块二 because /since 引导原因状语从句
→考点 1 because 表直接客观原因,专门用于回答 why 提问
【教材原文例句】
Mark couldn’t come because he had to work.
马克来不了,因为他得工作。
I couldn’t phone you because I didn’t have your number.
我没法给你打电话,因为我没有你的手机号。
高频易错禁令
because 与 so不能同时出现在同一个句子中
错误:Because it rained, so we stayed home.
正确 1:Because it rained, we stayed home.
正确 2:It rained, so we stayed home.
→考点 2 since 表 “既然”,陈述双方已知、显而易见的理由
教材原文例句
Since everyone is here, let’s start.
既然大家都到齐了,我们就开始吧。
词汇辨析
because:用于回应他人疑问,解释对方未知原因
since:陈述双方都清楚的客观事实,无需对方提问
综合分层练习
单项选择
(1) —Why didn’t you eat breakfast? —______ I got up too late.
A. If B. Because C. Since
(2) ______ you know the truth, I won’t hide it from you.
A. Since B. Because C. If
(3) He stayed at home ______ his leg hurt badly.
A. so B. because C. if
选词填空(because /since)
(1) We didn’t go out ______ the wind was too strong.
(2) ______ you are free now, let’s play basketball together.
(3) She cried ______ she lost her new pen.
汉译英
(1) 我昨天迟到了,因为我错过了公交车。_________________________________
(2) 既然所有人都准备好了,我们可以出发了。_____________________________
单句改错(划出错误,改写正确句子)
Because it rained heavily, so we stayed at home.
修改:________________________________________________
模块三 综合提升训练(单元整合真题式练习)
题型一 选词填空(if /because/since)+ 词形变形
选词填空
(1) ______ you finish your homework, you can watch TV for an hour.
(2) Tom failed the test ______ he didn’t study hard.
(3) ______ no one disagrees with the plan, we will carry it out.
(4) You will get cold ______ you go out without a coat.
动词适当形式填空
(1) If we ______ (catch) the early bus, we ______ (arrive) there before noon.
(2) He ______ (not join) us last night because he ______ (have) a piano lesson.
(3) If you ______ (not read) the book, you may not know the story.
题型二 单项选择 + 整句翻译
单项选择
(1) You can take a break ______ you finish all the tasks.
A. if B. because C. since
(2) ______ the light is off, he must not be in the office.
A. If B. Since C. Because
(3) I didn’t buy the shirt ______ it was too expensive.
A. if B. since C. because
汉译英
(1) 如果你早点睡觉,明天早上你就不会犯困。
(2) 既然天气很好,我们去郊外野餐吧。
(3) 他昨天没来上学,因为他生病了。
课堂知识梳理(课堂背诵)
一、if 条件状语从句
If + 一般现在时 + 祈使句:表建议,语序可互换,注意标点;
If + 一般现在时,主句 will/may:主将从现,描述未来假设;
标点口诀:从句在前加逗号,从句在后无逗号。
二、原因状语从句引导词
because:回答 why,客观直接原因,禁止与 so 连用;
since:意为 “既然”,描述双方熟知的事实。
拓展课堂任务(展示加分题)
分别写出 1 个 if、because、since 引导的完整句子,书写规范、语法无误可课堂展示。
if:________________________________________________
because:__________________________________________
since:____________________________________________
参考答案(教师备用页)
模块一 if 从句
考点 1
语序转换:Make sure you visit the Science Museum if you ever go to London.
单选:1.B 2.A
词形填空:1.forget; look 2.rains; take
汉译英:
If you have any questions, put up your hand now.
If you want to visit the museum, make an appointment in advance.
考点 2
单选:1.A 2.A 3.B
词形填空:1.comes; will start 2.will miss; don’t hurry 3.arrives
互译:
如果你不锻炼,就无法保持身体健康。
If it doesn’t snow tomorrow, we can go for a walk in the park.
模块二 because & since
单选:1.B 2.A 3.B
选词填空:1.because 2.Since 3.because
翻译:
I was late yesterday because I missed the bus.
Since everyone is ready, we can set off.
改错:It rained heavily, so we stayed at home. / Because it rained heavily, we stayed at home.
模块三 综合训练
选词填空:1.If 2.because 3.Since 4.if
词形填空:1.catch; will arrive 2.didn’t join; had 3.don’t read
单选:1.A 2.B 3.C
翻译:
If you go to bed early, you won’t feel sleepy tomorrow morning.
Since the weather is fine, let’s go for a picnic in the countryside.
He didn’t come to school yesterday because he was ill.
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