The boy is the travel agent. He is checking the tickets.
The boy who/that is checking the tickets, is the travel agent.
That’s the parcel. It came in the mail.
That’s the parcel which/that came in the mail.
We’re studying science. It helps us to find out a lot about the world around us.
We’re studying science which/that helps us to find out a lot about the world around us.
Grandpa can’t remember the town. He was born there.
Grandpa can’t remember the town where he was born.
The bus was very crowded. I took it this morning.
The bus that I took this morning was very crowded.
The car looks great! . The car is a Ferrari.
The car that looks great is a Ferrari.
I can't remember the place. I lost my wallet at that place.
I can't remember the place where I lost my wallet.
My neighbor was very rich. She left a big tip for the waiter.
My neighbor who left a big tip for the waiter was very rich.
You should go to Dr. Aldrin. He’ll give you a common exam.
You should go to Dr. Aldrin who will give you a common exam.
The gardener’s wife has just had her third baby. She has been married for six years.
The gardener’s wife who has been married for six years, has just had her third baby.
Did you mail the letters? They were on my table.
Did you mail the letters which/that were on my table?.
The horse came in last. You were telling me about it.
The horse that/which you were telling me about, came in last.
I left the job. The reason is confidential.
The reason why I left the job is confidential.
That’s the dog. It can understand everything.
That's the dog that can understand everything.
Bring me the books. I forgot them on my table.
Bring me the books that/which I forgot on the table.
The subject interested everyone. You wrote about it last week.
The subject which/that you wrote last week, interested everyone.
The story can’t possibly be true. He told it to us.
The story that he told us can't possibly be true.
Mrs. Farliana belongs to an organization. It assists hospitals.
Mrs. Farliana belongs to an organization which/that assists hospitals.