請問假設語氣用法?

[nickyen (友人認識孔祥宇嗎)]

  與現在事實相反

  If+S+過去式+..., S + would V...
                  could

  與過去事實相反

  If+S+had have p.p +..., S + would have p.p

  條件句與過去事實相反,主要子句為現在

  If+S+had have p.p +..., S + would V.....
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