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1、9A M2U5 The human brain第四课时导学案由if, if.not和unless引导的条件状语从句条件状语从句 在句子中作条件状语的从句称为条件状语从句,可置于句首、句尾,有时还可置于主语和谓语之间。引导条件状语的连接词有:if, unless等。如:If we pay much attention to the earth, well have a better world. I.条件状语从句的两种可能(1)主句从句都为一般现在时,表示这一行为引起的必然结果,可用when代替if。If(when)you heat water, it boils 如果你加热水,它会沸腾。(2)
2、从句谓语动词为一般现在时,主句谓语动词为一般将来时或情态动词及祈使句形式,表示将可能引起的结果。We may buy a car if my husband passes the test. 如果我丈夫通过测试,我们可能会买辆车。II. if 条件句的时态搭配if从句用一般现在时,主句用一般将来时If he runs, hell get there in time.如果他用跑的,他就会及时赶到那儿。if从句用一般现在时,主句用may/might/can/must/shouldV.原If you want to lose weight, you must/should eat less brea
3、d. 如果你想减肥,你必须/应该少吃面包。从句用一般现在时,主句用一般现在时 If you heat ice, it turns to water.如果把冰加热,它就会化成水。注意:1 Unless = ifnot 2 if = not unless第四课时学习诊断I. Choose the best answers.( )1. Ill go to meet you if I _free.A. would be B. will be C. am D. was( )2. I wont write to John _ he writes to me first.A. if B. whether C
4、. while D. unless ( )3.Peter will cook for his parents _ the International Day of Families comes. (2012 38题)A. unless B. when C. until D. though ( )4.We will have no water to drink _we dont protect the earth. (201037.题)A. until B. before C. though D. If ( )5. The artist didnt stop improving his pain
5、ting _he got satisfied.A) unless B) because C) when D) until. Rewrite the following sentences as required 1. I wont go to Kittys birthday party if she doesnt invite me.(保持句意不变)I wont go to Kittys birthday party _ she _ me.2. Take the underground,or youll be late for the lecture.(保持句意不变)You _ be the
6、late for the lecture _ you take the underground.3. We will have no water to drink unless we learn to save water.(保持句意不变) We will have no water to drink _ we _ learn to save water.4. I wont go to the party unless Im invited. (保持句意不变)I_ go to the party _ Im invited.5. I will sleep with the window open
7、 unless it is really cold. (保持句意不变)_it _ really cold, I will sleep with the window open.6.You will get a toothache. You dont clean your teeth regularly. (保持句意基本不变)You will get a toothache_ you clean your teeth.7.You will be late for school unless you get up early. (保持句意基本不变) You will be late for sch
8、ool you get up early.(每空格填一词)8. You will pass the exam if you work hard. (保持原句意思)You pass the exam you work hard.(每空格填一词)9. go out/ tomorrow/ I/rains/wont/if/it(连词成句)_10.glasses/ see/ I wear/will/if/more/I/clearly(连词成句)_. Reading comprehensionChoose the best answerWe surveyed(调查) 300 young people on
9、 what they like to do at weekends. One hundred people are from the ages of 11-18, one hundred 19-26 and one hundred 27-35. The following shows their answers:( )61. How many people enjoy playing computer games in the 11-18 group?A. 20. B. 50. C. 60. D. 75.( )62. What do the people of 19-26 enjoy doin
10、g most?A. Watching TV. B. Going to the movies.C. Playing computer games. D. Taking a walk.( )63. Which two activities do most people enjoy doing? A. Playing computer games and watching TV.B. Playing computer games and taking a walk.C. Watching TV and going to the movies.D. Going to the movies and taking a walk.( )64. From the chart above, we can see the older people are, the more they like _.A. watching TV B. taking a walk C. going to the movies D. playing computer games( )65. Which of the following is TRUE according to the chart? A. Fewest people like tak
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