频率副词用于描述事件、行为或状态发生的频率，它们在句子中的位置通常是在实义动词之前，非实义动词（如系动词、助动词和情态动词）之后。以下是一些常见的频率副词及其使用示例：

always- 总是

We always go to the gym on weekends.

usually- 通常

She usually reads a book before bed.

often- 经常

They often play basketball together.

sometimes- 有时

I sometimes stay up late.

rarely- 很少

He rarely misses a class.

never- 从不

She never eats candy.

frequently- 经常

They frequently travel to Europe.

occasionally- 偶尔

I occasionally visit my grandparents.

hardly ever- 几乎不

I hardly ever cook.

constantly- 一直

She is constantly learning new skills.

regularly- 定时地

We regularly attend yoga classes.

all the time- 无时无刻不

He is all the time thinking about his work.

every once in a while- 每隔一段时间

They meet every once in a while.

now and then- 间或

She goes to the beach now and then.

once in a blue moon- 偶尔一次

I only go to the movies once in a blue moon.

from time to time- 不时地

He checks his email from time to time.

repeatedly- 频繁地

They repeatedly try to solve the problem.

daily- 每天

She brushes her teeth daily.

weekly- 每周

He goes to the gym weekly.

monthly- 每月

They meet monthly.

yearly- 每年

They celebrate their anniversary yearly.

这些频率副词可以根据句子的需要放在不同的位置，但通常它们都遵循上述的句子结构规则。使用频率副词可以使句子更加生动和具体，帮助听者或读者更好地理解动作发生的频率。