Grammar,Unit 7 Memory,1. To learn the conditional sentences 2. To learn if not and unless,objectives,Conditional sentences (2),If you make the picture big, strange or silly, you will remember it better.,Review,the simple present tense,the simple future tense,We have already learnt to use conditional sentences to talk about probable results.,Conditional sentences,If Im hungry, I will_.,If Im tired, I will_.,eat some food,have a rest,Look and say,Review,If Im ill, _.,I will see a doctor,If Im late, _.,I will say sorry,If it rains tomorrow, I_.,will watch TV at home,If it _ tomorrow, _.,Ill play basketball,doesnt rain,If you take a fish out of water, _.,it dies,If you switch off the light, _ _.,the rooms,becomes dark,Try to finish the following sentences.,the result that will certainly happen,the result that will certainly happen,If you put salt into water, _.,If you heat ice, _,it disappears,it turns into water.,a possible action,the result that will certainly happen,a possible action,the result that will certainly happen,if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.,A2,S1: What happens if you switch off the lamp? S2: The room becomes dark. S1: Are you sure? S2: Of course, Im 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, Im sure. If you put wood into water, it floats.,Complete these sentences with the words in brackets.,A3,If 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),heat,it turns into,cool,it turns into,floats if you pour it on,boils if you heat,if . not and unless,Have A L k,1. 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.,not,If,will not remember,Unless,get,will not remember,will forget,unless,understand,will be late,if,do not leave,Unless,improve,you will lose,go,Ready?,If 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ifnot (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：,Ill 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, Ill 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 rains,doesnt rain tomorrow,tomorrow,Exercise,用unless 和 ifnot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 school,Unless it rains,goes to school,doesnt rain,dont leave now,Unless you leave now,wont catch,wont 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),B2,2. 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.,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 wil