态助动词有十三个:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 无过去时形式的情态助动词有must need used to ought to 希望着对你有帮...
态助动词有十三个:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 无过去时形式的情态助动词有must need used to ought to 希望着对你有帮...