ought to有没有人称变化

6天前 - We have done things we ought not to have done and _ undone things we ought to have done..C. ought to have come D. shouldn’t have come...

2017年9月22日 - ought to有没有过去式和第三人称单数形式 如一道题目 He( )应该 have gone home 15 minutes ago 怎么填 还有 如果是一般现在时又怎么填.ought to 并没...