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Yes, to show the tense or time of the verb, as well as to show if it is in the passive voice. The verb that does this is called the auxiliary or helper verb (it gives grammatical information about the verb) and the main verb conveys the action of the sentence.
Main verbs are also known as lexical verbs.
Finite verbs are verbs in a tense: verbs in the infinitive, therefore, do not carry tense.
The results have (auxiliary verb) shown (lexical verb) ...
The results will (auxiliary verb) determine (lexical verb) ...
To show (verb in the infinitive) the results, the measurements were taken (auxiliary plus finite verb) regularly.