These adverbs tell us that in which manner the action occurs or how the action occurs or occurred or will occur.
She speaks loudly.
He was driving slowly.
You replied correctly.
He runs fast.
They solved the problem easily.
Listen to me carefully.
Adverbs of frequency tell us how many times the action occurs or occurred or will occur.
e.g. daily, sometimes, often, seldom, usually, frequently, always, ever, generally, rarely, monthly, yearly.
He goes to school daily.
She never smokes.
He is always late for class.
They always come in time.
Barking dogs seldom bite.
The employees are paid monthly.
The employees are paid every month.