Unit 7 Memory Grammar A 条件状语从句 课件 2024-2025学年沪教牛津版英语八年级上册

8A Unit7 Memory Grammar A 条件状语从句(条件句) 条件状语从句表示在……条件下某事才能发生,从句是主句动作发生的前提或条件,通常由连词if引导,意为“如果” 条件状语从句(1) 一、定义 条件状语从句指由连接词if/unless等引导的状语从句。 If you walk along the Bund, you will see many old buildings. 我们用条件句谈论 _. 可能的结果 (从句谈论 可能的动作) (主句谈论可能的结果) 复习 一般将来时 一般现在时 用法 nobody can use it _ they have the password. 二、句子语序 主句+从句. 从句,主句.(中间有逗号) 三、句型结构及时态 If you work hard, you will be successful. If you finish your homework, you can watch TV. If you feel cold, close the windows. 主将从现 主情从现 主祈从现 条件状语从句表示在……条件下某事才能发生,从句是主句动作发生的前提或条件,通常由连词if引导,意为“如果” Presentation If you put some salt into water, what happens to it? It disappears. Grammar A Conditional sentences (2) If you put salt into water, it disappears. if意为如果, 谈论可能的行为 主句谈论 必然的结果 当if条件句谈论 时, 遵循“主现从现”原则。 一般现在时 一般现在时 客观规律 A1 Read these if-clauses and match them with the results. Presentation Grammar A Conditional sentences (2) 条件状语从句表示在……条件下某事才能发生,从句是主句动作发生的前提或条件,通常由连词if引导,意为“如果” Presentation heat it turns into cool it turns into floats if you pour it on boils if you heat Grammar A Conditional sentences (2) Fill in the blanks. 1. We _ at home if it rains tomorrow. (stay) 2. Oil _ if you put it on water. (float) 3. If I have enough money, I _a car.(buy) 4. Your memory_ better if you live a healthy life.(work) 5. If you push a baloon heavily, it _. (burst爆裂) will stay floats will buy bursts 可能的结果 确定的结果 will work 可能的结果 可能的结果 确定的结果 条件状语从句 用法 if 条件状语从句 if … not/unless 条件状语从句 表示可能/肯定发生的结果,放主句前后均可 ①主将从现:主句为将来可能出现的情况;if从句表示可能的结果 ②主现从现:客观真理;主从句都用一般现在时;if可以用when来替代 引出某件事发生/成立所必需的条件:“除非…否则…” unless引导的从句用一般现在时,主句用一般将来时(主将从现) 8A Unit7 Memory Grammar B if...not and unless Presentation Grammar B if …not and unless 条件句 (2) unless的意思等于if...not. B1 Draw lines to match the beginnings of the sentences in Column A with the endings in Column B. Rewrite the following sentences with unless. 2. You will get a toothache if you do not brush your teeth every day. Unless you brush your teeth every day, you will get a toothache. / You will get a toothache unless you brush your teeth every day. B2 3. This room will get very hot if you do not open the window. 4. If you do not close that window, flies will get in. Unless you open the window, this room will get very hot./ This room will get very hot unless you open the window. Unless you close that window, flies will get in./ Flies will get in unless you close that window. 5. I will leave this restaurant if the waiter does not come soon. Unless the waiter comes soon, I will leave this restaurant. / I will leave this restaurant unless the waiter comes soon. 1. If he _ (come), I _ (tell) him about the news. 2. You can’t buy the car unless you _ (have) enough money. 3. A mouse _ (run) away quickly if it _ (see) a cat. 4. If it _ (not snow) tomorrow, we _ (go) sightseeing. 5. You can’t take part in the activity unless you _ (be) a member of the club. comes will tell have runs sees doesn’t snow will go are I. 根据句意用所给单词的适当形式填空。 Exercise 1. Dr. Wang will give us a talk if it is fine tomorrow. (同义句转换) Dr. Wang _ give us a talk _ it is fine tomorrow. 2. Linda will have free time. She’ll take memory lessons. (合并句子) Linda will take memory lessons _ she _ free time. 3. Sam will miss the first bus unless he gets up early. (同义句转换) Sam will miss the first bus _ he _ get up early. will not unless if has II、按要求完成下列句子。 if doesn’t 4. Unless you are careful, the car may hit you. (用 if 改写句子) _ you are careful, the car _ hit you. If may not 5. No one is going to help you unless you change your mind. (用 if 改写句子) No one is going to help you _ you _ your mind. if don’t change 6. I won’t buy that cup _ it costs less than ￥20. (用 if 或 unless 填空) unless 一、选择题 1. -Let’s prepare for our baseball game. -OK. We’ll lose the game_we try our best. A. because B. unless C. after D. since 2. You will catch a cold _ put on more clothes. A.if you B.if you will not C.unless you D.until you A. unless B.until C. if 3. -Let's go climbing Langshan Mountain this Saturday _the weather is fine. -Good idea! A. though B.if C.unless 19 4. Mike, you can’t go out _ you finish all your homework today. A.when B.if C.because D.unless 5. If they _ a trip to China, they_ to Xi’an first. A.will take; will fly B.will take; fly C.take; will fly D.take; fly Summary 条件 状语从句 用法 if / unless :(表示可能的结果) 位置 主句+从句 从句,主句——中间有逗号 时态 主将从现 主情从现 主祈从现 if: 客观规律(表示必然的结果) 主现从现 Conditional sentences 条件状语从句 How to be a Man! (怎样成为一个顶天立地的人!) EV录屏5.2.5软件录制 Lavf58.33.100 本视频由湖南一唯信息科技开发的EV录屏软件录制, www.ieway.cn $$