The commonest adverbials of frequency are:

always    never    normally    occasionally    often   
rarely    seldom    sometimes    usually     

We usually put adverbials of frequency in front of the main verb:

We often spend Christmas with friends.
I have never enjoyed myself so much.

but they usually come after the verb be:

He was always tired in the evening.
We are never late for work.

We use the adverbial a lot to mean often or frequently. It comes at the end of the clause:

We go to the cinema a lot.

but before another time adverbial:

We go to the cinema a lot at the weekend.

We use much with a negative to mean not often:

We don’t go out much. (= We don’t go out often)

We use how often or ever to ask questions about frequency. How often comes at the beginning of the clause:

How often do you go to the cinema?
How often have you been here?

ever comes before the main verb:

Do you ever go to the cinema at the weekend?
Have you ever been there?

Longer frequency phrases, like every year or three times a day usually come at the end of the clause:

I have an English lesson twice a week.
She goes to see her mother every day.

Exercise