Use nouns in the possessive case instead of prepositional phrases.

Перефразируйте, употребляя притяжательный падеж.

1. The flat of my sister is large. 2. The work of these students is interesting. 3. Where is the office of the manager? 4. The house of my brother-in-law is very big. 5. What is the name of the man who lent us the money?