2019-2020学年外研版高中英语选修8创新教案:Module 6 Section 3
2019-2020学年外研版高中英语选修8创新教案:Module 6 Section 3第2页

  He may/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)。

  Could he have finished the task?

  他可能把任务完成了吗?

  Can he be at home now?

  他现在能在家吗?

  2. 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"。

  She must/may/might/could arrive before 5 o'clock.

  5:00前她一定/可能/也许到。

  (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"。

  He must/may/might/could be listening to the radio now.

  他一定/可能/也许正在听收音机。

  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"。

  It must have rained last night. The ground is wet.

  地面湿了,昨晚肯定下雨了。

  He cannot have been to that town.

  他不可能去过那个镇。

  3. 情态动词表推测的特殊用法

  (1)can除了表推测,用于疑问句和否定句中外,还可以表示"在某段时间内一时的可能性"。

  It can be quite windy there, especially in spring.

  那里有时容易刮风,特别在春季。

  (2)must表示"一定,非得;偏要",强烈语气。

  If you must smoke, you can smoke in that room.

  如果你偏要吸烟,你可以在那个房间吸。

  

  集中演练1

  用适当的情态动词填空

  ①-Tom is never late for weeks. Why is he absent today?

-Something must have happened to him.