Frequency adverbs can be placed at various points in the sentence, but are most commonly used before the main verbs and after be verbs.
The most common Frequency Adverbs are:
I always do my homework.
They are seldom home when we call.
He's usually sleeping at 9 o'clock.
She's never been to Paris.
Now, take a look at the conversation below.
A: Do you come here often?
B: Yes. I'm here occasionally.
A: What do you usually do here?
B: Sometimes I just sit and ponder the meaning of life.
We can also use:
Once a week/month/year
Twice a week/month/year