频度副词后的动词可以是动词的任何形式，具体什么形式和频度副词本身没有关系。频度副词主要有：often (经常），usually (通常)，sometimes (有时），always (总是），never (从不）等等表示频率的副词。
副词的位置
1) 多数副词放在动词后面，或者放在be动词、助动词或情态动词之后，实义动词之前。 如果实义动词后有宾语，则放于宾语之后。
I am also Bush.
我也是布什。
I can also do that.
我也可以这样做。
I also want to play that game.
我也想玩这游戏。
I get up early in the morning every day.
每一天的早晨我都起得很早。
She didn't drink enough water.
她没有喝足够的水 。
We can go to this school freely.
我们可以免费到这家学校学习。
They left a life hardly then.
当时他们的生活很艰难。
I have seen this film twice with my friends.
这部电影我和朋友看过两次。
2) 副词修饰形容词时，一般放在被修饰词之前，但enough除外。
It's rather easy, I can do it.
这很容易，我能做到。
He did it quite well.
他做得相当好。
It's rather difficult to tell who is right.
很难说谁是对的。
He didn't run fast enough to catch the train.
他的奔跑速度不足以快到能够追上火车。
3) 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。
I often help him these days.
这些日子我经常帮助他。
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