过去完成时和非现实的反事实可以进行条件倒置:<ref>{{cite encyclopedia |last1=Bhatt |first=Rajesh|last2=Pancheva|first2=Roumyana |editor-last1=Everaert |editor-first1=Martin | editor-last2=van Riemsdijk |editor-first2=Henk |encyclopedia= |title=The Wiley Blackwell Companion to Syntax |url=https://people.umass.edu/bhatt/papers/bhatt-pancheva-cond.pdf |year=2006 |publisher=Wiley Blackwell |doi=10.1002/9780470996591.ch16}}</ref> | 过去完成时和非现实的反事实可以进行条件倒置:<ref>{{cite encyclopedia |last1=Bhatt |first=Rajesh|last2=Pancheva|first2=Roumyana |editor-last1=Everaert |editor-first1=Martin | editor-last2=van Riemsdijk |editor-first2=Henk |encyclopedia= |title=The Wiley Blackwell Companion to Syntax |url=https://people.umass.edu/bhatt/papers/bhatt-pancheva-cond.pdf |year=2006 |publisher=Wiley Blackwell |doi=10.1002/9780470996591.ch16}}</ref> |