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在虚拟语气中，but分句所起的作用相当于if从句的反义句，点出现在或过去的某一事实，故用陈述语气。(but I wish 除外)
1)I would have invited her to the party but I didn’t know her well. (but… = if I had known her well)
2)I would have had a rest but I had so much work to do. (but…= if I hadn’t had so much work to do)
3)She would have come to see you but she was ill that day. (but… = if she hadn’t been ill that day)
4)I should have gone to the party but I was not invited. (but… = if I had been invited)
5)I have no Chinese-English dictionary, but I wish I had one.
6)I have never been to the moon, but I wish I had.
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