这个结构用来表示没有覆行义务或不明智地忽略了该做的事。在否定式中这一结构表示从前发生的、错误的或愚蠢的事。
You ought to have told him that the paint on that seat was wet.
你本应该告诉他椅子上的油漆还没有干。
You should have turned his omelette;he likes it turned.
你本应该给他摊的鸡蛋翻个身的;他喜欢吃两面都煎透的摊鸡蛋。
They ought to have stopped at the traffic lights.
他们本应在红绿灯处停下。
She shouldnt have opened the letter;it wasnt addressed to her.
她不应该拆开信,信封上写的不是她的名字。
The Emergency Exit doors shouldnt have been blocked.
紧急出口的门本来不应被堵死。