thinks [someone] knows where
Mary pensa di sapere dove abita Tom.
Mary thinks she knows where Tom lives.
Tom pensa di sapere dove trovare Mary.
Tom thinks he knows where to find Mary.
Pensa di sapere dove trovarlo.
He thinks he knows where to find it.
Tom pensa di sapere dove sia andata Mary.
Tom thinks he knows where Mary went.
Mary pensa di sapere dove trovare Tom.
Mary thinks she knows where to find Tom.