1、随堂演练及时体验 巩固提升.单句语法填空(不多于 3 个单词)1He _ (write) just one novel so far.答案与解析 has written so far 意为“到目前为止” ，是完成时态的时间状语。2Now that she is out of a job, Lucy _ (consider) going back to school, but she hasnt decided yet.答案与解析 has been considering 根据 “but she hasnt decided yet”判断， Lucy 还在考虑这件事，要用现在完成进行时，表示动作还
2、要继续下去。3 More patients _ (treat) in hospital this year than last year.答案与解析 have been treated treat 与 patient 是动宾关系，应用被动语态；this year 是表示现在时间的状语，所以应用现在完成时的被动语态。4The first use of atomic (原子的) weapons was in 1945 and their power _ (increase) enormously ever since.答案与解析 has been increased ever since 意为“自
3、那以来；从那至今” ，要与现在完成时连用；power 是 increase 的被执行者，所以要用被动语态。5Years ago we didnt know this, but recent science _ (show) that people who dont sleep well soon get ill.答案与解析 has shown 根据 but 表示的转折意义判断，后面应说明现在的情况，与几年前相对照，并且空后说明了结果，所以应用现在完成时。6He was hoping to go abroad but his parents _ (decide) that they wont s
4、upport him unless he can borrow money from the bank.答案与解析 have decided 根据句意判断，应该是“他父母已经决定不供养他” ，所以应用现在完成时。7My brother is an actor. He _ (appear) in several films so far.答案与解析 has appeared 句中有时间状语 so far，意为“迄今为止；到现在为止” ，可确定用现在完成时。8The coffee is wonderful! It doesnt taste like anything I _ (have) befo
5、re.答案与解析 have had before 应用于完成时，所以应填 have had。9The temperature _ (fall) to minus 3 in London and it is likely to get even colder as the day goes on.答案与解析 has fallen/has been falling 现在温度已降到零下3 度了，用现在完成时或现在完成进行时。句意：伦敦气温下降到零下 3 度，可能还要更冷。10Over the past decades, sea ice _ (decrease) in the Arctic as a
6、result of global warming.答案与解析 has been decreasing 由时间状语 over the past decades 可知，主句只能用现在完成进行时，表示 “一直” 。.单句改错1What have you been doing before you left Oxford？_答案 havehad2Its a good job. Have you done it all by yourself？_答案 Have you doneDid you do3Its a long time since you come to see me._答案 comecame4Alice didnt see much of Henry lately._答案 didnt seehasnt seen5Im glad to tell you that you passed the exam._答案 passedhave passed
