Unless she had had an alarm clock, she would havemissed the train.（事实：她没有闹钟）中两个had是什么意思?

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Unless she had had an alarm clock, she would havemissed the train.（事实：她没有闹钟）中两个had是什么意思?
Unless she had had an alarm clock, she would havemissed the train.（事实：她没有闹钟）
中两个had是什么意思?

Unless she had had an alarm clock, she would havemissed the train.（事实：她没有闹钟）中两个had是什么意思?
虚拟语气结构对过去的虚拟：had +动词过去分词
所以第一个had是助动词第二个是过去分词

had had:第一个had是过去完成时的助动词,第二个had是have的过去分词.它们一起构成过去完成时.

条件句中用过去完成时,是对过去情况的虚拟语气,表示与过去事实相反的假设.

Unless she had had an alarm clock, she would have missed the train.
=If she had not ...

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had had:第一个had是过去完成时的助动词,第二个had是have的过去分词.它们一起构成过去完成时.

条件句中用过去完成时,是对过去情况的虚拟语气,表示与过去事实相反的假设.

Unless she had had an alarm clock, she would have missed the train.
=If she had not had an alarm clock, she would have missed the train.

句意:如果她没有闹钟,她就已经错过了那列火车.
事实是:她有闹钟,所以她没有错过火车.

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