句型转换。1. There will be more rain in 100 years.(改为否定句) There _______ _______ more rain in 100 years.2. He will go on a picnic in two days.(对划线部分-八年级英语

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2. 否定句中用can’t / couldn’t(不可能), may not/might not (可能不)。   
(1)It can’t/couldn’t be the headmaster. He has gone to America.  这不可能是校长,他去美国了。   
(2)He may not/might not know the scientist. 他也许不认识那位科学家。   
3. 疑问句中用can/could (能……?)。    
 (1)Could he have finished the task? 他可能把任务完成了吗?    
 (2)Can he be at home now?  他现在能在家吗?   
注:以上三种句式中情态动词的语气按程度都是依次递减的。Might, could并非may, can的过去式,而表示语气较为委婉或可能性较小。   

(二)情态动词表推测的三种时态   
1. 对将来情况的推测,用“情态动词 + 动词原形”。    
(1)She must / may / might / could arrive before 5.  5: 00 前她一定/可能/也许到。    
(2)She must/may/might/could walk miles and miles among the hills without meeting anyone.   
           她一定/可能/也许会在山里一连走好几英里而遇不到一个人。   
2. 对现在或一般情况的推测,用“情态动词 + be”,“情态动词 +be doing”或 “情态动词 + 动词原形”。    
(1)He must / may / might / could be listening to the radio now. 他一定/可能/也许正在听收音机。   
(2)He can’t ( couldn’t ) / may ( might ) not be at home at this time. 这个时候他不可能/可能不在家。   
(3)Mr. Bush is on time for everything .How can ( could ) he be late for the opening ceremony ?   
          布什先生一向准时,这次开幕式他怎么可能迟到呢?    
3.对过去情况的推测,用“情态动词 + have +过去分词”。   
(1)It must / may / might / could have rained last night .The ground is wet.  地湿了,昨晚肯定/可能/也许下雨了。   
(2)The door was locked. He can ( could ) not / may ( might ) not have been at home . 门锁着,他不可能/可能不在家。   
(3)Can / Could he have gotten the book? 难道他找到书了吗?    
注:情态动词 should /ought to表推测时,意为“想必会,理应……”但与“have +过去 分词”连用时,则又可构成虚拟语气意为“本应该做某事却没做”。 
例如:   
(4)It’s seven o’clock. Jack should/ought to be here at any moment.   
     现在七点钟了,杰克理应随时到达。(推测)   
(5)She should / ought to have attended your birthday party, but she had to look  after her mother in hospital. (虚拟)   
她本该出席你的生日晚会的,可是她得在医院照顾她妈妈。   
(6)Tom should not /ought not to have told me your secret, but he meant no harm.   (虚拟)   
汤姆本不该告诉我你的秘密,可是他并无恶意。

考点名称:反身代词

上一篇:—Will you _______ take part in theschool sports meeting next week? —I hope so. [ ]A. can B. be able to C. mustD. may-八年级英语     下一篇:The desk is not dirty. You _____clean it.[ ]A. mustn'tB. shouldn't C. needn't D. can't-八年级英语
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