How many types of adverbial exist?
In addition to these five element patterns, it’s also possible to broadly categorise adverbials into four key types based on their specific functions.
1) Adjuncts: Adjuncts are optional adverbials which add information about an event or state in relation to its circumstances, such as its place, time, condition or manner. (‘I failed the exam this morning.’)
2) Conjuncts: These are used to join clauses together, forming logical and rhetorical relations between expressions such as addition, contrast and order. (‘Jessica studied hard; therefore, she received a good grade.’)
3) Disjuncts: Disjunct adverbials usually provide additional information about entire clauses, expressing attitudes, evaluations and probabilities. (‘Surprisingly, she failed.’)
4) Adverbial Complements: These are most often prepositional phrases (though they can also be adverbs and noun phrases) which act as key arguments of verbs, particularly for verbs of caused motion which require spatial or timescale references. (‘She put the pen in her pencil case.’)
Note that while types 1 to 3 are optional (in the sense that removing them will only disrupt meaning and not grammar), type 4 is the one mandatory kind of adverbial.