Adverbs of frequency tell us how often something takes place or happens.
There are lots of them. Here are some examples:
– Always: He is always ready to take on heavy responsibilities.
– Usually: We usually go to restaurant on Sundays.
– Regularly: I communicate with him regularly by letter.
– Normally: I dont normally take my holiday in midsummer.
– Often: They often went carolling at Christmas.
– Sometimes: Sometimes, I just need someone to talk to.
– Occasionally: Occasionally Alice would look up from her books.
– Rarely: Rarely have I seen such a scene.
– Seldom: Opportunity seldom knocks twice.
– Never: He never turned up.
…

Position of Frequency Adverbs
We often place adverbs of frequency in these adverb positions.
Rule 1
Most adverbs come before the verb.
Examples:
I sometimes watch Chinese films.
She never eats vegetables.
I always read comic books.
They rarely watch music channels.
Rule 2
Use adverbs of frequency after these five forms of be: am, is, are, was, were.
Examples:
I am always worried about my study result.
She is usually very happy.
She is always cooking spaghetti.
You are seldom anxious about my health.
Rule 3
When a verb has a helping verb, the adverb goes after the first part of the verb.
Examples:
Drivers should always wear a seat belt.
Richard doesnt usually smoke.
Rule 4
Sometimes we use frequency adverbs at the beginning of the sentence.
Examples:
Always wash your hands before the meal!
Often he walked.
Sometimes I go skating.
Rule 5
Sometimes we use frequency adverbs at the end of the sentence.
Examples:
We read books occasionally.
They like to watch TV often.
We go to school by bike sometimes.