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浅谈must 的用法
首先,我们来看下面几道题.: 1.They must arrive at school on time every day,_______? 2.All visitors must report to reception , ________? 3.You mustn’t take your cellphones to you school, ______? 4.He must have known result of the exam, ________? 5.Our teacher must be working in her office now,_______? 6.Tom must have finished the task last week, ______? 7.He must be a student, _______? 8.They must have learned 2000 new words by the end of last year, _______?
解析: ①must 用作情态动词,意为”必须”时, 反意疑问句中用needn’t 如.1.2.两个题,答案为 : 1.needn’t they 2.needn’t they。mustn’t 表示”禁止,千万不要”,反意疑问句中用must ,如3题，答案为must you.②must 作为情态动词.用于肯定句中,表示对现在或过去事情有把握的推测,意为”一定”.其中对过去事情进行推测时,其结构为 must have done ……。当must 用于肯定句总表示推测,其反意疑问句可以按下方法进行:去掉must ,然后把句子按照句中已有的时间状语进行时态还原,对还原后的句子进行反意疑问,即可.如:5.7 两题.分别可还原为:5.Our teacher is working in her office now.isn’t she / he ? 7.He he is a student , isn’t he? 6.8两题则可以根据时间状语last week 和 by the and Last year 分别还原为: 6.Tom finished the task last week , didn’t he ?和 8.They had learned 2000 new words by the end of last year , hadn’t they? 注:当must have done … 中没有明确的时间状语时,则把其还原成现在完成时,如4题, 可还原为” He has known the result of the exam, hasn’t he ? 另外,must 用于一段疑问句中,还可以表示说话者厌烦的语气 如:Must you always ask me such questions? Must you make noises in my cla?
黑龙江省讷河二中
张立芬
李明蓉
