Voice
They have not submitted their classwork regularly.

The classwork have not been submitted regularly by them.
The class work is not being submitted regularly by them.
The class work has not been submitted regularly by them.
The class work are not being submitted regularly.

ANSWER DOWNLOAD EXAMIANS APP

Voice
They will demolish the entire block.

The entire block will have to be demolished by the
The entire block is being demolished.
The entire block will be demolished.
The block may be demolished entirely.

ANSWER DOWNLOAD EXAMIANS APP

Voice
I saw him leaving the house.

He was seen to be leaving the house.
He had been seen leaving the house.
He was seen leaving the house by me.
Leaving the house he was seen by me.

ANSWER DOWNLOAD EXAMIANS APP