Mom would have been home this morning.
過去式助動+完成式 的確可以表達 與過去事實相反 (我好恨這種文法解釋)
對我來說，看到這句話只會讓人覺得話沒說完，感覺少了假設的另一半。
例：
Mom would have been home this morning if her flight hadn't been delayed.
※ 引述《skywidth (skywidth)》之銘言：
: would have 可以表示對過去的猜測嗎? 還是一定是與過去事實想反?
: 例如
: Not so long ago,this notion would have been politically,economically
: and socially-speaking,an impossibility.
: 在不久前，這想法"應是"不可能的
: 與過去事實相反的話就有點怪
: 那麼如果一個說話者說
: Mom would have been home this morning
: 意思是?
: 與過去事實相反 還是猜測?
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