Voice
I don't know his whereabouts.

No one knows his whereabouts.
His whereabouts are not known to me.
His whereabouts is not known by me.
His whereabouts had not been known to me.

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Voice
The old lady touched and patted the cow.

The patted cow touched the old lady.
The cow was touched by the old lady patting her.
The cow patted and touched the old lady.
The cow was patted and touched by the old lady.

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Voice
Before festivals the shops are thronged with men, women and children making various purchase.

Men, women and children throng the shops before festival making various purchases.
The shops are thronged by people making purchases.
Men, women and children make purchases during festivals.
During festival people throng the shops.

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Voice
Lion does not eat grass, however hungry he may be.

Grass is not being eaten by a lion, however hungry he may be.
Grass is eaten not by a lion, however hungry he may be.
Grass was being not eaten by a lion, however hungry he may be.
Grass is not eaten by a lion, however hungry he may be.

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