高考英语状语从句复习课件讲义.ppt

5. So clever was the student that he was able to work out all the difficult problems. ( ) 6. As long as you don’t lose heart, you’ll succeed. ( ) 7. Try as he might, he could not find a job. ( ) 8. The old lady treats the boy as if he were his own son. ( ) The job is not so difficult as I thought it would be. ( ) （2）可用作并列连词，其意义为“那时，这时”，相当于and at this/that time。常用于句式： Somebody was doing something when… Sb. was about to do sth. when… (刚要……这时突然……) Somebody had just done something when 3．as 的用法： (1) as 着重强调主句和从句的动作同时或几乎同时发生，如： The students rose as the teacher entered the classroom. (2)as还可以表示“随着……”，如： As time goes by, it is getting colder and colder. (3) As 还能表示“一边……一边”，如： He looked behind from time to time as he went. 4．如果主句表示的是短暂动作，而从句用延续性动作的进行时态表示在一段时间内正在进行的动作时，when, while与as 可互换使用。如： When/While/As I was walking down the street, I came across an old friend of mine. 5. It will not be long ______ we meet each other again. 6. I __________ (be) at his bedside since he _______ (become) ill. 7. It ____________ (be) two years since we _______ (begin) to use this machine. Conclusion: 1）句型It will be/was＋一段时间＋before… “还要过多久才……” 如： It will be two years before he leaves the country. 2）句型It will be/was not＋一段时间＋before… “不多久就……”，如： It was not long before he worked out the problem. 3）句型It be＋一段时间＋since… ,该句型主句和从句中动词谓语时态的搭配很严格。 It is/has been … since sb. did sth. 如： It is three years since she joined the army. 从句动词为瞬间动词，表示“自……以来，已经过去多长时间了”。 It is four days since she was ill. 从句谓语动词为延续性动词，表示“自……结束以来，已经过去多长时间了”。 2．用于否定句时，主句谓语动词是非延续性动词，从句为肯定，意为“某动作直到某时间才开始”。如： He won’t go to bed till/until she returns. 3．till不可以置于句首，而until可以。如： Until you told me I had no idea of it. 4．not…until句型中的强调和倒装说法： It was not until you told me that I had any idea of it. Not until you told me did I have any idea of it. 在使用时： 一、要注意两者的含义区别。 二、要注意状语从句和定语从句的区别。 三、要注意在状语从句中不可使用介词+which引导。出题者既考状语从句又考定语从句和状语从句的区别。还加入名词性从句这一干扰项。