方式副词说明行为的方式,如walk slowly, run fast, speak loudly, behave gently时间副词描述行为发生的时间,如returned yesterday, leave tomorrow, meet tonight地方副词描述行为发生的地点,如eat outside, stay inside, go upstairs, live downtown程度副词说明某特征达到的程度,用在形容词、副词、动词前面,如:very important, greatly surprised, sound asleep, wide awake,completely agree频率副词说明动作发生的频率,如often quarel, sometimes get angry, usually eat little语法书中没有持续副词这一概念。按我理解,持续副词说明动作或状态的持续性,是方式副词的次分类,如:he walks continually. It's been raining continuously.希望能帮到你。谢谢点赞的。踩者请在评论中赐教,说明原因。