表示与过去事实相反的假设语气就无法使用could?
I couldn't swim, so I didn't go with them to the beach.(x) If I could swim, I would have gone with them to the beach. 变成与现在事实相反的假设语气
(o) If I had been able to swim, I would have gone with them to the beach.
这样的结论对吗？
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