The book is about a haunted castle and the ghosts therein. = The book is about a haunted castle and the ghosts that live in it.
We should study the region and the animals thereof. = We should study the region and its animals.
Yes,they are corect. But note that the words therein and therof are not very commonly used, especially in spoken English. Clive
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Yes,they are corect.
But note that the words therein and therof are not very commonly used, especially in spoken English.
Clive