He is the only student ( ) plays Mario Kart at this school.
He is the only student who plays Mario Kart at this school.
I think the girl ( ) I know is smart.
I think the girl whom I know is smart.
The girl ( ) plays piano is amazing.
The girl who plays piano is amazing.
The friend ( ) I met yesterday loves soccer.
The friend whom I met yesterday loves soccer.
I saw the friend ( ) I went to Disneyland with last week.
I saw the friend whom I went to Disneyland with last week.
The man ( ) likes skydiving is crazy.
The man who likes skydiving is crazy.
The classmate ( ) I go to school with loves anime.
The classmate whom I go to school with loves anime.
The teacher ( ) I talked to last week gave me homework.
The teacher whom I talked to last week gave me homework.
The woman ( ) is a doctor is Tomoko.
The woman who is a doctor is Tomoko.
I saw a man ( ) has a Ferrari.
I saw a man who has a Ferrari.
The woman ( ) I have guitar lessons with is kind.
The woman whom I have guitar lessons with is kind.
I know the boy ( ) likes pizzas
I know the boy who likes pizzas.