Foundation
English
Verb
Verb
Tenses
Question
The report proved false.
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Solution
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The report proved false.
Proved - Intransitive verb.
Complement - False.
Here 'prove' verb describes a state, so it cannot have an object. "False" is used as a complement of the verb.
A transitive verb has an object that receives the direct action of the verb. Generally, a transitive verb takes a single object.
An intransitive verb does not require an object. It can make a meaningful sentence without taking a direct object. 
There are some intransitive verbs that require a word or a phrase to make the sentence complete and make sense. Such verbs require a complement and are called verbs of incomplete prediction such as is, become, seem, turn and so on. Here, "proved" is a verb of incomplete prediction.