A. We use adverbs to give more information about the verb and use adverbials of manner to say how something happens or how something is done.
A1. use adverbials of place to say where something happens.
A2. use adverbials of time to say when or how often something happens.
A3. use adverbials of probability to show how certain we are about something.
B. An adverbial can be an adverb. or an adverb with an intensifier. or a phrase with a preposition.
C. We normally put adverbials after the verb.
C1. or after the object or complement.
C2. But adverbials of frequency (how often) usually come in front of the main verb.
C3. But if we want to emphasise an adverbial we can put it at the beginning of a clause.
C4. If we want to emphasise an adverb of manner we can put it in front of the main verb.