广东省深圳市文汇中学八年级英语上册 Module 4 Unit 7 Memory Grammar 课件

课件32张PPT。GrammarUnit 7 Memory 1. To learn the conditional sentences
2. To learn if …not and unlessConditional sentences (2)If you make the picture big, strange or silly, you will remember it better.Reviewthe simple present tensethe simple future tenseWe have already learnt to use conditional sentences to talk about probable results.Conditional sentencesIf I’m hungry,
I will______________. If I’m tired,
I will_____________. eat some foodhave a restLook and sayReviewIf I’m ill,
__________________. I will see a doctorIf I’m late,
_______________.I will say sorry If it rains tomorrow,
I_____________________.will watch TV at homeIf it _____________ tomorrow,
_________________.I’ll play basketballdoesn’t rainIf you take a fish out of
water, _______.it diesIf you switch off the
light, _________
____________.the rooms becomes darkTry to finish the following sentences.the result that will certainly happenthe result that will certainly happenIf you put salt into water, ____________.If you heat ice,
__________________it disappearsit turns into water.a possible actionthe result that will certainly happena possible actionthe result that will certainly happenif引导的条件状语从句当表示客观事实、结果时，if条件句的
主句和从句都用一般现在时。if 从句可以放在句首，也可以放在句末。
如果把 if 从句放在句首，常用逗号将其与
主句隔开。如：Water turns into ice if the temperature is below zero.
= If the temperature is below zero, water turns into ice.注意：if引导的条件状语从句通常不用一般将来时。在需要表达将来含义时，一般用现在时表示。 Read these if-clauses and draw lines to match them with the results.A1 In pairs, make conversations about the sentences in A1 on page 103. A2S1: What happens if you switch off the
lamp?
S2: The room becomes dark.
S1: Are you sure?
S2: Of course, I’m sure. If you switch
off the lamp, the room becomes dark.S1: What happens if you put wood into
water?
S2: It floats.
S1: Are you sure?
S2: Of course, I’m sure. If you put wood
into water, it floats. Complete these sentences with the words in brackets.A3If you ____ ice, __________ water. (turns/heat/it/into)
If you ____ steam, __________ water. (into/cool/turns/it)
Oil ___________________ water. (on/floats/pour/it/you/if)
Water ______________ it. (you/heat/boils/if)heatit turns intocoolit turns intofloats if you pour it onboils if you heatif ... not and unless1. If you do not get enough sleep every
night, you will not remember things well.
2. Unless you get enough sleep every night, you will not remember things well.
3. You will forget something very quickly unless you understand it well.
4. You will be late for school if you do not leave now.
5. Unless you improve your handwriting, you will lose marks in the exam.1. ___ you do ____ get enough sleep every
night, you ________________ things well.
2. ______ you ____ enough sleep every night, you _______________ things well.
3. You _________ something very quickly ______ you __________ it well.
4. You _________ for school __ you ___________ now.
5. ______ you ________ your handwriting, ___________ marks in the exam.notIf will not rememberUnlessgetwill not rememberwill forgetunlessunderstandwill be lateifdo not leaveUnlessimproveyou will losegoIf you do not work hard, you will not succeed.
如果你不努力，你就不会成功。
= Unless you work hard, you will not succeed.
除非你努力工作，否则你不会成功。 unless意为“除非”，和if…not (如果……不……) 的意思相近，且两个结构通常可以互换使用。在unless引导的从句里，通常用现在时表示将来。如：I’ll not attend the party unless he invites me.
除非他邀请我，否则我不会参加这个派对。
Unless you have good idea, I’ll take his advice.
除非你有更好的主意，否则我将采取他的建议注意：unless用于引出某事发生或成立所必需的条件。如：
除非你能做到，否则不要随便许诺。
You should not promise anything unless you can do it.1. 如果明天不下雨，我们就去远足。
If it _____________________, we will go hiking.
=We will go hiking ________________
___________.unless it rainsdoesn’t rain tomorrowtomorrowExercise用unless 和 if…not完成句子。2. 除非天下雨，他通常是走路去上学。
He usually _____________ on foot if it ___________.
=_____________, he usually ___________
on foot.
3. 如果你现在不走，你就赶不上火车了。
If you ______________, you __________ the train.
= ___________________, you __________ the train.goes to schoolUnless it rainsgoes to schooldoesn’t raindon’t leave nowUnless you leave nowwon’t catchwon’t catch Draw lines to match the beginning of the sentences in Column A with the endings in Column B. (P 105)B1 Rewrite the following sentences with unless. (P 105)B22. 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.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.条件状语从句:if从句unless从句主将从现主现从现时态口诀:将来客观事实
习惯Review
if 引导的条件状语从句歌：
if条件句不一般，几个要点记心间。
条件句放在前，逗号要放句中间。
条件句表可能，主句多用将来时；
条件句表事实，主句常用现在时。
if条件句有特点，现在时把将来替；
这个规则要牢记!1. If he _____ (come), I ______ (tell) him
about the news at once.
2. You can’t buy the iPad 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.comeswill tellhaverunsI. 根据句意用所给单词的适当形式填空。seesdoesn’t snowwill goare1. 除非你早点起床，否则你会赶不上早
班公共汽车。(unless)
　　　　　　　　　　　　　　　　　
2. 如果你把冰放在火上，它会融化。(if)
　　　　　　　　　　　　　　　　　
3. 如果你把图书馆的书丢了的话，你就
得赔偿。(if)II. 根据汉语及括号内的提示翻译句子。You will not catch the early bus unless you get up early. If you put ice onto fire, it melts.If you lose the library book, you should pay for it. 4. 除非你小心，要不会发生意外的。(unless)
　　　　　　　　　　　　　　　　　
5. 如果你一直努力下去，你会成功的。(if)
　　　　　　　　　　　　　　　　　You will have an accident unless you are careful. If you keep trying, you will succeed /be successful. 1. Finish the exercises in Learning
English.
2. To preview Speaking on Page 106Homework