2015年卫生类职称英语语法之否定句（9）
2015-01-19 16:21 来源：医学教育网
2015年卫生类职称英语语法之否定句：
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。
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2015-01-19 16:21 来源：医学教育网
2015年卫生类职称英语语法之否定句：
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。
