I wish i could have slept longer this morning ,but i had to get up and come to class.could have slept是什么句型 为什么要用have slept

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I wish i could have slept longer this morning ,but i had to get up and come to class.could have slept是什么句型 为什么要用have slept
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I wish i could have slept longer this morning ,but i had to get up and come to class.could have slept是什么句型 为什么要用have slept
I wish i could have slept longer this morning ,but i had to get up and come to class.
could have slept是什么句型 为什么要用have slept

I wish i could have slept longer this morning ,but i had to get up and come to class.could have slept是什么句型 为什么要用have slept
could have done,是在对过去的虚拟时,主句的谓语动词结构所使用的形式.
我希望今早上能睡得久一点,但我还得起床去上课.后半段是过去发生的真实情/状况,所以用一般过去时had to,而前半句是不（太）可能发生的（早上要去上课,不可能睡得久）,要用虚拟语气.

虚拟语气，could have done sth.
本可以做某事而未做。
我希望可以在早上睡更长时间，但我必须起床去学校。
本可以睡更长时间，但未发生这件事，用虚拟语气。
could have done sth.是固定用法

虚拟语气 could have done 本希望做某事而没有做成功
wish 表示愿望

could have done有三种用法
1.本能做却没有做，常用于表示一种责备/惋惜，如I could have finished my homework 。
2.表示对于过去的一种推测，可能。列He could have flied to China ，because he wasn t at home.
3.用于虚拟语气，如if条件句的虚拟，用于主句同would，sh...

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could have done有三种用法
1.本能做却没有做，常用于表示一种责备/惋惜，如I could have finished my homework 。
2.表示对于过去的一种推测，可能。列He could have flied to China ，because he wasn t at home.
3.用于虚拟语气，如if条件句的虚拟，用于主句同would，should，might have done。wish虚拟，But for，without，的虚拟（同if条件句）
本题中用的就是wish虚拟，可从后一句话中判断他没有睡得很久，这只是他的一宗假设和希望。

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