i ___come yesterday,but i couldn'tA was to have B ought to想问ought to 也表示应该做但没做 这里为什么不能用

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i ___come yesterday,but i couldn'tA was to have B ought to想问ought to 也表示应该做但没做 这里为什么不能用
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i ___come yesterday,but i couldn'tA was to have B ought to想问ought to 也表示应该做但没做 这里为什么不能用
i ___come yesterday,but i couldn't
A was to have B ought to
想问ought to 也表示应该做但没做 这里为什么不能用

i ___come yesterday,but i couldn'tA was to have B ought to想问ought to 也表示应该做但没做 这里为什么不能用
was to come是“正要来”；而ought to come是“应该来”,后者的意思不符合作者表达的需要.

be to 表示按计划
句子意思是按计划我本来明天应该到的，但是我没有。
句子强调按照计划我本应该。所以要用be to

虚拟语气，如果用ought to的话可以，但是虚拟的是“过去的动作”，所以要用ought to have done
反观A， was to do是虚拟现在或将来的， 表示过去将来时，则沿用was to have done
记住：虚拟过去，条件句是过去完成时：had done，主句是：情态动词+have done
...

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虚拟语气，如果用ought to的话可以，但是虚拟的是“过去的动作”，所以要用ought to have done
反观A， was to do是虚拟现在或将来的， 表示过去将来时，则沿用was to have done
记住：虚拟过去，条件句是过去完成时：had done，主句是：情态动词+have done
动词一定是完成时态，不管过去完成时还是现在完成时，不能使原形或过去式
原形或过去式，是虚拟现在 或将来

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