Passive Voice Sentences are Bad

Writing in the passive voice is not looked upon as being good for a story. What is a passive and active voice? Further examples will be added.

Present Tense
Active:                                         Passive:
She plays a song.                      A song was played by her.
She does not sing.                    A song is not sung by her.
I am writing a letter.                A letter is being written by me.
I am not writing a letter.         A letter is not being written by me.
Am I writing a novel?                 Is a novel being written by me?

Past Tense
Active:                                             Passive:
She has finished a novel.           Her novel has been finished by her.
I killed a bird.                                 A bird was killed by me.
He was driving a car.                    A car was being driven by him.

Future Tense
Active:                                               Passive:
She will have finished her work. Her work will have been finished by her.
They will have elected him.           He will have been elected by them.

Active:
Subject + will/shall + have + past participle form of the verb + object

Passive:
Object of the active sentence + will/shall + have + been + past participle form of the verb + by + subject of the active sentence