In my opinion adverbs are equally as important as the verbs they describe.
A verb contains no information other than if it’s a fact about an action/state or the action/state in progress.
Only an adverb can give the details needed for how that action or state is done. Without them the language is boring, sterile.
Adverbs fall into 3 main categories.
To tell us how often the action is performed or state is reached.
Used in all tenses.
She always feels sick when we travel by car.
To tell us about the action/state’s strength, depth, impact and importance
Used in all tenses
He walked slowly to the door.
To tell us emotional, metaphorical information about the action/state.
Used in all tenses
He walked painfully to the car.
Mixed adverbs add more impact and information.
He walked slowly, painfully towards the door.
This is very complex and I would recommend that you put the adverb after the verb. There are some intensifying adverbs that must go before the verb, for example hardly.
There are many verbs that cannot go before the verb but this is because of the nature of the verb and usage.
The bell rang loudly. Yes
The bell loudly rang. Grammatically Yes. Usage No.
Some adverbs can be put both before and after the verb but there is a shift of emphasis.
They quickly kissed. = the time before they kissed was very short.
They kissed quickly. = the kiss was very short.
Adverbs that are also adjectives.
A good example of this is hard/hardly.
Hard as an adjective describes difficulty.
The exam was hard.
Hard as an adverb is an intensifier.
He studied hard for the exam.
Hardly is an intensifying adverb meaning very little.
He hardly studied for his exam.
Most adverbs are formed by adding the suffix ly to an adjective but not all.
For example – good/well
Adverbs + Adjectives
We tend to use intensifiers a lot with adjectives. They always go before the adjective.
She is suitably skilled for the job.
The only problem is understanding that you cannot use all intensifying adverbs with every adjective. Because of this we have extreme adjectives and extreme intensifiers.
A little, Quite, Fairly, Rather, Very, Incredibly
Completely, Totally, Absolutely
These adverbs must then be used with the correct adjective depending on the adjectives own intensity.
For example – with heat
It was a rather hot day90-100%
boiling, roasting, sweltering, scorching
It was scorching weather.
Really is an exception and can be used to intensify all adjectives.
Some adverbs can be tricky to use because their function changes depending on context and even intonation.
Positive – quantifier
A bit of milk. = some milk
Positive – intensifier
A bit special. = very special
Negative – intensifier
A bit expensive. = very expensive.
I’d rather you pay it personally. = emphasis on you making payment.
I’d rather you pay it personally. = emphasis on my opinion.