八年级下册状语从句讲解及练习

1 状语从句 用来修饰主句中的动词 副词和形容词的从句叫状语从句 根据其含义状语从句可分为时 间状语从句 地点状语从句 条件状语从句 原因状语从句 结果状语从句 比较状语从 句 目的状语从句 让步状语从句 1 时间状语从句 1 时间状语从句常用 when as while before after since till until as soon as 等连词来引导 It was raining hard when got to school yesterday While he was doing his homework the telephone rang 2 在时间状语从句里 通常不用将来时态 用现在时态表示将来的动作或状态 I ll ring you up as soon as I get to New York 3 在带有 till 或 until 引导的时间状语从句的主从复合句里 如果主句用肯定式 其含义是 一直到 时 谓语动词只能用延续性动词 如果主句用否定式 其含义是 直到 才 在 以前不 谓语动词可用瞬间动词 The young man read till the light went out Let s wait until the rain stops 2 条件状语从句 1 条件状语从句通常由 if unless 引导 What shall we do if it snows tomorrow Don t leave the building unless I tell you to 2 在条件状语从句里 谓语动词通常用现在时态表示将来的动作或状态 I ll help you with your English if am free tomorrow He won t be late unless he is ill 3 祈使句 and or 陈述句 在意思上相当于一个带有条件状语从句的复合句 Hurry up or you ll be late If you don t hurry up you ll be late Study hard and you will pass the exam If you study hard you will pass the exam 3 原因状语从句 1 原因状语从句通常由 because since as 引导 He didn t come to school because he was ill As it is raining we shall not go the zoo Since you can t answer the question I ll ask someone else 2 2 because 表示直接原因 语气最强 Because 引导的原因状语从句多放在主句之后 回答 由 why 提出的问题 只能用 because As 和 since 语气较弱 一般用来表示明显的原因 由 as 和 since 引导的原因状语从居多放在句首 Why aren t going there Because I don t want to As he has no car he can t get there easily Since we have no money we can t buy it 3 because 和 so 不能同用在一个句子里 4 结果状语从句 1 结果状语从句由 so that such that so that 引导 He is so poor that he can t buy a bike for his son She is such a good teacher that everybody likes her My pencil fell under the desk so that I couldn t see it 2 so that 语 such that 可以互换 在由 so that 引导的结果状语从句中 so 是副词 与形容词连用 其结构是 so 形容 词 副词 that 从句 He was so glad that he couldn t say a word The hall is so big that it can hold 2 000 people Mother lives so far away that we hardly ever see her 5 比较状语从句 比较状语从句通常由 as as 比较级 than 等连词引导 Tom runs faster than John does This classroom is as big as that one 6 目的状语从句 1 目的状语从句通常由 so that in order that 引导 We started early so that we could catch the first train He studies hard so that he could work better in the future We used the computer in order that we might save time 2 so that 既可引导目的状语从句 又可引导结果状语从句 区别这两种从句的办法有两个 1 目的状语从句里往往带有情态动词 can could may might 等 2 从意思上看 目的状语从 句往往表示的目的很明确 Speak clearly so that they may understand you 目的状语从句 Jack is badly ill so that he has to rest 结果状语从句 7 让步状语从句 1 让步状语从句通常由 although though 等连词引导 Though he is young he knows a lot Although I am tired I must go on working 3 2 although though 不能用在同一个句子中 我们不能说 Though it was raining hard but he still went out 应该说 Though it was raining hard he still went out 或 It was raining hard but he still went out 8 地点状语从句 地点状语从句常常由 where 来引导 Go where you like Where there is a will there is a way 一 选择题 1 he s old he can still carry this heavy bag A Though B Since C For D So 2 Do you know if he to play basket ball with us I think he will come if he free tomorrow A comes is B comes will be C will come is D will come will be 3 In the zoo if a child into the water and can t swim the dolphins may come up him A will fall to help B falls to help C will fall help D falls helping 4 I don t remember he worked in that city when he was young A what B which C where D who 5 We will stay at home if my aunt to visit us tomorrow A comes B come C will come D is coming 6 The police asked the children cross the street the traffic lights turned green A not before B don t when C not to until D not after 7 I was late for class yesterday there was something wrong with my bike A when B that C until D because 8 I ll go swimming with you if I free tomorrow A will be B shall be C am D was 9 In the exam the you are the mistakes you will make A careful little B more careful fewest C more careful fewer D more careful less 10 You should finish your lessons you go out to paly A before B after C when D while 11 I hurried I wouldn t be late for class A since B so that C as if D unless 12 When you read the book you d better make a mark you have any questions 4 A which B that C where D though 13 The teacher raised his voice all the students could hear him A for B so that C because D in order 14 He took off his coat he felt hot A because B as C if D since 15 It is that we d like to go out for a walk A a lovely day B too lovely a day C so lovely a day D such lovely a day 16 Mary had much work to do that she stayed at her office all day A such B so C too D very 17 I felt very tired I tried to finish the work A Although B Because C As D As if 18 the day went on the weather got worse A With B Since C While D As 19 well you can drive you must drive carefully A So long as B In order that C No matter how D The moment 20 Write to me as soon as you to Beijing A will get B get C getting D got