[tex]❃\large\tt\:Passive\:to\:Active\:Voice\:❃[/tex]
The given sentence is in the passive voice. The focus is on the action; therefore, the doer of the action is not important in this form. You can easily tell whether a sentence is in the passive voice or not, the use of by.
On the other hand, the active voice is what we usually use. We may call it the normal voice.
[tex]•\:\large\tt Passive \: Voice:[/tex]
The chairs were filled by the spectators for the hearing.
[tex]•\:\large\tt Active \: Voice:[/tex]
The spectators filled the chairs for the hearing.
