always, usually, often, sometimes等。
副词是一种用来修饰动词,形容词,全句的词,说明时间,地点,程度,方式等概念.
频度副词可放在实义动词的前面,情态动词和助动词的后面.
例：often,always,usually,early,today, lately, next,last,already,generally,frequently, seldom,ever,never,yet,
例句：
（1）I often help him these days.
这些日子我经常帮助他.
（2）I always remember the day when I first came to this school.
我常常记得我第一次来学校的那一天.
（3）You mustn't always help me.
你不能老是帮助我.
（4）He seldom comes to see us.
他很少来看我们.
（5）We usually go shopping once a week.
我们通常一周买一次东西.
（6）The new students don't always go to dance.
新学生并不时常去跳舞.