An active verb form is one like reads, wrote, broke, is writing or will write. The subject of an active verb is usually the person or thing that does the action, or is responsible for what happens.
Jane wrote a story. (Jane (subject) did the action.)
We are eating our dinner.
John will collect our clothes from the dry cleaner.
In English, an intransitive verb can only appear in the active voice.
The sun rose at 6.30 this morning.
Ann smiled knowingly.