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An adverbial is a word (an adverb), phrase, or clause which modifies (changes, restricts or adds to the meaning of) a verb. An adverbial can be a noun phrase (we met that afternoon), a prepositional phrase (we met in the cafe), or a clause (we met because we needed to talk) as well as an adverb, but always functions to modify the meaning of a verb. A sentence can contain just one adverbial or several.
Some adverbs have the same form as adjectives.
Adjective Adverb
Louise caught the fast train. The train was going quite fast.
We didn't have a long wait. We didn't have to wait long.
Some adverbs have the same form as adjectives.
Adjective Adverb
Louise caught the fast train. The train was going quite fast.
We didn't have a long wait. We didn't have to wait long.
The position of an adverbial depends on what it modifies. It can modify a word or phrase or a whole clause. Its position also depends on what type of adverbial it is and whether it is a single word or a phrase.
When an adverbial modifies a verb or a whole clause, there are three main places we can put it.
Front: Really, I can't say.
Mid: I can't really say.
End: I can't say, really.
Sometimes we can also put an adverbial after the subject: I really can't say.
In The shop on the corner is closed., the adverbial modifies the noun.
Putting an adverb that tells us when at the end of a sentence is a neutral position, but these adverbs can be put in other positions to give a different emphasis. All adverbs that tell us when can be placed at the beginning of the sentence to emphasize the time element. Some can also be put before the main verb in formal writing, while others cannot occupy that position.
Examples
Later Goldilocks ate some porridge. (the time is important)
Goldilocks later ate some porridge. (this is more formal, like a policeman's report)
Goldilocks ate some porridge later. (this is neutral, no particular emphasis)
https://www.ef.com/wwen/english-resources/english-grammar/adverbs-time/