Voice
We should not encourage indiscipline.

Indiscipline should have not encourages by us.
Indiscipline should not been encouraged.
Indiscipline should not be encouraged by us.
Indiscipline should not being encouraged.

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Voice
He was congratulated by his teacher on his brilliant success in the recent examination.

His teacher congratulated him for his brilliant success in the recent examination.
His teacher congratulated him.
His teacher congratulated him on his brilliant success in the examination.
He congratulated his teacher on his brilliant success in the examination.

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Voice
Who teaches you English?

By whom were you taught English?
By whom will you be taught English?
English is taught by whom?
By whom are you taught English?

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