oughtnottodo
含有oughtto的反意疑问句,陈述部分是肯定的,疑问部分用shouldn't/oughtn't+主语.在英式英语中用oughtto形式,在美式英语中用should形式.例如:
Yououghttoseethenewpicture,shouldn'tyou?
Teachersoughttobehonoured,oughtn'tthey?
Heoughttoknowwhattodo,oughtn'the?/shouldn'the?
oughtto是情态动词与canmaymust一样