卫生类职称英语备考否定句考点（9）
2015-05-11 11:53 来源：医学教育网
卫生类职称英语考试备考否定句考点，供考生参考。
他的设计肯定还没完成。
误：He mustn't have completed his design.
正：He can't have completed his design.
对比较有把握的推测，肯定句中用must，而否定句中用can't，对过去的推测，在must和can't后接完成形式。
相关资讯
2015-05-11 11:53 来源：医学教育网
卫生类职称英语考试备考否定句考点，供考生参考。
他的设计肯定还没完成。
误：He mustn't have completed his design.
正：He can't have completed his design.
对比较有把握的推测，肯定句中用must，而否定句中用can't，对过去的推测，在must和can't后接完成形式。
