Замените существительные с предлогом of притяжательным падежом, где
возможно:

1. The textbooks of these students are on the desk. 2. The
families of these workers are large. 3. The flat of my friend
is small. 4. The project of this engineer is good. 5. The floor of
the room is brown. 6. What is the name of his daughter?