Final answer:
An adverbial complement can be removed when it doesn't leave the verb or sentence incomplete, typically when the verb has an adverbial adjunct that provides necessary information.
Step-by-step explanation:
An adverbial complement can be considered essential to the meaning of a sentence and therefore can only be removed if it does not leave the verb or sentence incomplete. Given the choices, an adverbial complement can be removed when the verb also has an adverbial adjunct.
This is because the adverbial adjunct can provide the additional information typically offered by the adverbial complement, making the complement itself non-essential. In the case of transitive verbs, the adverbial complement cannot be removed as it completes the meaning by indicating to whom or what the action is directed.
For intransitive verbs, although they do not typically require an object, some may still require adverbials of place to be complete, so you cannot always remove the adverbial complement.An adverbial complement can be removed from a sentence when the verb also has an adverbial adjunct.