The man is a professor. He's going to give a lecture to our students.

⇒The man who is going to give a lecture to our students is a professor.

#Tunn!

Using relative clause1. The woman spoke to me. She was very helpful -> The woman who was very helpful, spoke to me

2. The man is professor. He's going to give a lecture to our students -> The man is going to give a lecture to our students, is professor

3. The artists performed many wonderful shows. We met them yesterday -> The artists whom we met yesterday, performed many wonderful shows

5. She found a dog. Its leg was broken-> She found a dog whose leg was broken

6. They are the children. Their team won the match -> They are the children whose team won the match

7. My brother is very kind to everyone. You met his wife last week . -> My brother whom you met his wife last week, is very kind to everyone

8. Those books belong to Ann. They are on the table -> Those books which are on the table, belong to ann

9. Tom is very careless. He lost his watch yesterday-> Tom 

who lost his watch yesterday, is very careless

10. I don't like the stories. They have unhappy endings => I don't like  the stories which have unhappy endings