Adverbs of frequency such as never, rarely, occasionally, sometimes, often, usually and always are used to describe how frequently an action occurs. These adverbs are typically placed before verbs but follow auxiliary verbs or the verb "to be." Additionally, phrases like once in a while, every day/month/year usually appear at the beginning or end of sentences to indicate frequency. Examples are provided of how different adverbs and phrases are used to specify timing, like every day meaning once per day.

1. Adverbs of Frequency

2. We use the Adverbs of Frequency to say
how frequently we do something.
Some of the most common are :
Never, Rarely, Occasionally, Sometimes, Often,
Usually and Always.
There are several adverbial phrases of
frequency. For example : Hardly ever, Once
in a while, Every day / month / year.

3. With the verb To Be we put the adverb AFTER
the verb.
I am always here.
We usually put the adverb BEFORE other verbs.
I sometimes buy a box of chocolates.
I hardly ever ate there.

4. With auxiliary or modal verbs, we usually
put the adverb AFTER the auxiliary or
modal.
She doesn’t usually stay here.
I have never visited them.
I can always help.

5. Adverbs of frequency can also go at the
beginning, middle or end of a sentence.
Occasionally I go dancing.
I occasionally go dancing.
I go dancing occasionally.
Always and Never do not normally go at the
beginning or end of sentences.

6. Once in a while and every day / month / year
usually go at the beginning or end of
sentences.
There are other phrases to show how
frequently something happens:
Every day = one time per day.
Once a week = one time per week.
Twice a week = two times per week.
Three times a week.

7. I have a shower every day.
She writes to me once a week.
They go shopping twice a week.
You have English classes three times a week.