What is an adverbial phrase ?
I recently learnt 'to boot' , meaning in addition, as well. And someone was saying it is an adverbial phrase. I think I know what is an adverb, but never learnt of adverbial phrase.
The term adverbial is a bane to the principled study of language. It is the epitome of the worst problem in the field of language study - a problem which should by now be regarded as a schoolkid problem - the problem of not understanding the difference between syntactic functions (or grammatical relations) and parts of speech or types of phrase.
For a few principled writers who use the term, an adverbial is a phrase which functions as an Adjunct in a sentence. The important point there is that adverbial in any principled description of language is a type of syntactic function (or grammatical relation). It is not a type of phrase or a type of word.
Syntactic functions (also described as grammatical relations) are the different jobs that chunks of words can do in a sentence or phrase. So for example the words the elephant you met yesterday, which happens to be a noun phrase, has the function of Subject in :
It has the function of Complement of a preposition in:
It has the function of Object in:
It has the function of Predicative Complement in:
It has the function of Determiner in a noun phrase in:
So as can be seen from the examples above, a type of phrase, in this case a noun phrase, can have many different types of function. It's also important to realise that the same syntactic function can be realised by many different types of phrase. So, for instance, Predicative Complements can be noun phrases, adjective phrases or preposition phrases:
In the examples above we see a noun phrase, an adjective phrase and a preposition phrase functioning as Predicative Complement of the verb BE.
Adjuncts in clause structure
So the important question here is: what's an Adjunct? In terms of clause structure, an Adjunct is an extra phrase in the clause. It is not a Subject or a Complement of the verb. A Complement of a verb is a phrase which fills a special slot set up by the verb. For example, the verb PUT has two special slots for certain types of phrase. Apart from a Subject slot, it has a slot for the thing that is being moved and it has a slot for the destination of that thing. If one of these slots isn't filled the sentence will be ungrammatical or seem a bit odd:
In the example above the pen and on the table are two separate Complements of the verb.
In contrast with Complements, Adjuncts in clause structure don't fill a special slot set up by the verb. They are syntactically and semantically extra elements. Sentences are well formed with or without Adjuncts. Adjuncts have no special relationship with the verb. In the following example at four o'clock is an adjunct:
The sentences above are well-formed with or without the phrase at four o'clock. Notice that we can stick this type of phrase on the end of just about any sentence regardless of the verb in the clause. There is no special relationship between PUT and the preposition phrase at four o'clock.
Very importantly for the discussion here, Adjuncts can take many different forms. For example, they can be adverb phrases, preposition phrases or noun phrases:
In the three examples above, for people who use the term in a principled way, the phrases very well, on Saturdays and every day are Adverbials. They are phrases which have a special function in the clause structure. The term adverbial is derived from the old-fashioned and unobservant idea that different parts of speech are related to specific different syntactic functions or grammatical relations. Adverbs have traditionally been regarded as having the special function of modifying verbs or verb phrases. The term adverbial therefore is used to describe phrases which have the function of modifying verb phrases. Remember though that there are many different types of phrase that can modify verb phrases, not only adverbs. The term adverbial then, when used in this way, means something like having an adverbish type of syntactic function. It does not mean that the phrase is an adverb or anything like that.
Of course, even that adverbish type of function idea is misleading. It gives us the idea that Adjuncts are usually adverbs - and they aren't.
Adverbials and prepositional phrases
Now, in the examples of the different types of phrase that can function as Adjunct, you will remember that we counted adverb phrases, preposition phrases and noun phrases. Most unfortunately, the term adverbial is often confused with the phrase category preposition phrase. People who use the term adverbial to mean preposition phrase, always also use the term to refer to Adjuncts, whether the Adjunct is a prepositional phrase or not. The problem with this is, of course, that not only are not all Adjuncts prepositional phrases, but not all prepositional phrases are Adjuncts!
Prepositional phrases can have many different types of function. For example they can be Subjects:
They can be Predicative Complements:
They can be Locative Complements:
They can be Modifiers in a noun phrase:
It was an out of the box solution
There are many other types of function that prepositional phrases can have. You need to be very careful therefore when you read passages which use the term adverbial. If the writers are thoughtful, careful and principled writers they will use the term to describe a particular type of function, namely Adjunct in clause structure. On the other hand they may be talking about a type of phrase, namely a prepositional phrase, as opposed to a noun phrase, for example. However, if you're very unlucky they will be mixing and matching the phrase type and the function without realising it. Nearly every writer who uses the term adverbial to mean a prepositional phrase will be guilty of this crime.
The worst problem here is that the people who do this do not understand what they are doing. They will quite happily screw up the line between functions and types of phrase within the same paragraph or even within the same sentence without the slightest idea what they're doing. Perhaps even more gravely than this, the use of the term adverbial is so unevenly used and so confused in terms of whether it is a function or a phrase category, that many writers even substitute the word adverb for the term adverbial. This means that you will see many intelligent people saying ridiculous things such as:
What to do about this
Ideally we can avoid actually using the term adverbial ever at all. But if we do have to use it, because our peers do for example, we need to be careful that we use it to refer to a function in clause structure. If we absolutely have to use it to refer to a type of phrase (specifically a prepositional phrase) we need to make it crystal clear to our readers or listeners that we are using it in this way. Most importantly we need to make sure that when we use it, we ourselves know exactly what we are referring to and that we don't slip between functions and phrase categories like a hormonally confused teenager.
Araucaria is right, the term adverbial is imprecise, i.e. it is used for a word class (an adverb group) and a sentence part. A lot of linguistic terms have come up in order to be more precise. My personal terminology is adverb group if a mean an adverb that consists of several words (word class), e.g.
I use the term adverbial sentence part (asp) if I want to speak of a sentence part.
I think everybody has to adopt some personal grammar terms (and abbreviatiations) to have more precise and simpler terms. Not every term linguists have invented is really recommendable.
I wrote this only to show how some things in the chaotic grammar terminology can be handled. Everybody has to find his or her own way.