摘要:所谓定时态就是在解情态动词题时.应确定所需情态动词是否符合特定的时态需要.例1: By the end of next year I'll ____write articles in English. A.can B.be able to C.can be able to D.be able to can 析:选B.该句句意为:明年我将能够用英语撰写论文.而can只能用于一般现在时和一般过去时.be able to则有更多的时态.因此用一般将来时.现在完成时等时态时应用be able to. 例2: You needn't do it today.but you will___do it tomorrow. A.must B.need C.have to D.be able to 析:选C.该句表示:你今天没必要做这件事.但你将有必要做这件事.在“有必要做某事 的种种表达法中must是不能用于将来时的.所以A为错误答案.need作情态动词不能用于肯定句.所以B也为错误答案.而have to是一个实义动词.可用于各种时态.所以C为正确答案. 从"情态动词+动词不定式完成式"看高考考点的稳定性 情态动词是几乎每年必考的语言点.其中,"情态动词 + have +过去分词"结构又是考得最多的.下面请看历届高考涉及此结构的试题: 1?There was plenty of time.She . A.mustn't have hurried B.needn't have hurried C.must not hurry D.couldn't have hurried [B] 2?The plant is dead.I it more water. A.will give B.woule have given C.must give D.should have given [D] 3?Where is my pen?I it. A.might lose B.would have lost C.should have lost D.must have lost [D] 4?I didn't hear the phone.I asleep. A.must be B.must have been C.should be D.should have been [B] 5?He you more help,even though he was very busy. A.might have given B.might give C.may have given D.may give [A] 6?Jenny have kept her word, I wonder why she changed her mind. A.must B.should C.need D.would [B] 7?We last night, but we went to the concert instead. A.must have studied B.might study C.should have studied D.would study [C] 8?Tom ought not to me your secret, but he meant no harm. A.have told B.tell C.b telling D.having told [A] 9?I told Sally how to get here, but perhaps I for her. A.had to write it out B.must have written it out C.should have written it out D.ought to write it out [C] 10?--There were already five people in the car but they managed to take me as well. --It a comfortable journey. 't be B.shouldn't be C.mustn't have been D.couldn't have been [D] 11 You didn't let me drive. If we in turn, you so tired. A. drove, didn't get B. drove; wouldn't get C. were driving; wouldn't get D. had driven; wouldn't have got [D] 12 Yesterday, Jane walked away from discussion. Otherwise she something she would regret later. A. had said B. said C. might say D. might have said [D] 13 --I stayed at a hotel while in New York. --Oh, did you? You with Barbara. A.could have stayed B.could stay C.would stay D.must have stayed [A] 14 Sorry I'm late. I have turned off the alarm clock and gone back to sleep again. A. might B. should C. can D. will [A] 15 My sister met him at the Grand Theatre yesterday afternoon, so he your lecture. A. couldn't have attended B. needn't have attended C. mustn't have attended D. shouldn't have attended [A] 显而易见.以上试题告诉我们:高考英语试题考点有很大的稳定性. 事实胜于雄辩.高考考点的 "稳定性"很大.从一定程度上.高考考点的 "稳定性"也告诉我们:高考英语命题是有规律的.不仅有规律.而且有很强的规律性.在复习迎考过程中.不仅要认真准备书本上成百上千的知识点.但更重要的还要去研究历届高考试题中的重要考点.提高复习效率. (附) "情态动语+动词完成式"这一考点.主要涉及以下几个结构: 1.can/must/will等+have+done多用来对过去发生的情况作出语气强弱不同的推测.具体使用时请注意以下几点: ① can一般用于疑问句和否定句, 极少用于肯定句. 例如:---Can she have gone to school? ---No, she can't have gone to school. I saw her just now. ② may表推测.一般不用于疑问句,疑问句中该用can, could或might. 例如:How could he have forgotten such an important thing? Might you have met him somewhere? ③ could, may, might 用于肯定句语气较弱.must用于肯定句语气很强; may, might 用于否定句语气较弱.can, could 用于否定句语气很强. 例如:He could/may/might have gone to school. 他可能上学去了. He must have gone to school. 他肯定是上学去了. He may/might not have gone to school. 他也许没去上学. He can't/couldn't have gone to school. 他肯定没去上学. ④ must表推测.一般不用于否定句,否定句中该用can或could. 误:We mustn't have met before. 正:We can't have met before. 注:以上情态动词后接不定式一般式可对现在的情况进行推测.其区别与上述各条类似. 例如:Can he be a student? He must/may/might/can't be a student.

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