请问IwishIcoulddoit是虚拟语气中与现在还是与将来事实相反?Iwish+过去=与现在事实相反；Iwish+should/would/could+do表示与将来事实相反；那么could既可以看做过去式,又可看做could+do,

Question

请问 I wish I could do it 是虚拟语气中与现在还是与将来事实相反?
I wish + 过去 = 与现在事实相反；
I wish + should/would/could + do 表示与将来事实相反；
那么 could 既可以看做过去式,又可看做 could + do,应如何理解?
希望回答者能按下面的格式回答：
（1）I wish I could do it 是与现在事实相反/将来事实相反（2选1）
（2）如果在（1）中选了一种,那么,请将另一种的用法写出,例如,您说它是与现在事实相反,那么请您告诉我应如何表达与将来事实相反,反之亦然.

Answer 1

这要看上下文.
-He worked all night on his dissertation yesterday.
-I wish I could do it for him. But I know nothing about his work.
-他昨晚为了他的论文开了通宵.
-我真想帮他.但我实在不会他的论文. (与过去相反)
-He is going to work all night today, as the deadline is tomorrow noon.
-I wish I could help him. But my work hasn't been finished yet.
-明天是截止了, 他今晚要开通宵了.
-我真想帮他, 但我自己的活也没干好呢. (与现状/将来相反)