Who will save us? (Passive) = By whom will we be saved?

Change the voice. (Passive) = Let the voice be changed.

The books read well. (Passive) = The books are read well.

My pen have been stolen. (Active) = Someone has stolen my pen.

I know the boy. (Passive) = The boy is known to me.

The superlative degree of costly is costliest.

The more you read, the less you understand.

The water in the pond is dirty.

My books were stolen yesterday.

My father insisted me on going abroad. 

Death is preferable to humiliation.

what is the time by your watch?

I can not make out what he says.

 The machine is out of order.

I can not be false to my friend.