Перефразируйте следующие предложения, употребив притяжательный падеж


1. The office of
our manager is very big.

2.  The computer of Tom and Helen is
modern.

3. Do you know the telephone number of the Petrovs? 

1. Our manager's office is very big2. Tom and Helen's computer is modern3. Do you know Petrovs' telephone number?

1) Our manager`s office is very big.2) Tom and Helen`s computer is modern.3) Do you the Petrovs` telephone number?