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I might have given you more help,but I was too busy.

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I might have given you more help,but I was too busy.
用was 为什么不用had been?
虚拟语气与过去事实相反时 条件句不是用 If+主语+had+过去分词么?
I might have given you more help,but I was too busy.
此句是虚拟语气,与过去的事实情况相反,即我本可以给你更多的帮助,但实际并没有
此时主句用might/should/could+have+done,从句用was/were/did(即一般过去时)
这是虚拟语气的知识点