it would be a good idea if ...,为什么用would,不用will?

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it would be a good idea if ...,为什么用would,不用will?

it would be a good idea if ...,为什么用would,不用will?
it would be a good idea if ...,为什么用would,不用will?

it would be a good idea if ...,为什么用would,不用will?
表示个人意愿,在这里用虚拟语气,即用will的过去式.

过去式吧......

虚拟语气主句用 would + v. 从句用过去式.