They were preparing lunch when I arrived.Change to passive voice
Lunch was being prepared by them when I arrived.
Lunch was being prepared when I arrived
Lunch was prepared when I arrived.
None of these
The Board of directors appointed him as teacher.Change the voice
He was appointed as teacher by the board of directors.
A teacher was appointed by the board of directors.
He was being appointed as teacher by them.
He appointed as teacher by the board of directors.
Raju had taken my umbrella.Change to passive voice.
My umbrella had been taking by Raju.
My umbrella had been taken by Raju.
My umbrella was taken by Raju.
My umbrella had taken by Raju.
Someone will speak Japanese at the meeting.Change to passive voice
Japanese will be spoken by someone at the meeting.
Japanese will be spoken at the meeting.
Japanese is to be spoken at the meeting.
He has been arrested.Change the voice
The police have arrested him.
Arresting has been done on him.
The police arrested him.
They make cars in the factory at Surat.Write in passive voice.
Cars are made in the factory at Surat.
Cars are being made in the factory at Surat.
Cars were made in the factory at Surat.
Cars being made in the factory at Surat.
The boys were performing a drama.Change to passive voice.
A drama was performed by the boys
A drama was being performed by the boys.
A drama were being performed by the boys
A drama being performed by the boys.
I like Mango.Change to passive voice.
Mango is being liked by me
Mango is liked by me
Mango was liked by me.
My pocket has been stitched.Change the voice
Someone has stitched my pocket.
My pocket has stitched by someone.
Someone stitched my pocket.
The carpenter is making a chair.Write in passive voice
A chair is made by the carpenter
A chair is being made by the carpenter.
A chair was made by the carpenter.
A chair being made by the carpenter.
