Relatives pronouns

Hi friends!

  Last day,Gema taught us the relative pronouns.We use them to add a relative clause to a sentence.For example:
             
            -This is my friend.His brother is in Paris.
                       >This is my friend whose brother is in Paris.(Este es mi amigo cuyo hermano está en París)

We have six relative pronouns:Where,Who,Whose,Which,When and That.

    Here,we are going to put six examples:

         >Where: -He was in London.I was born.
                           *He was in London where I was born.
         >Who: -He is the man.He fights with Yeray.
                           *He is the man who fights with Yeray.
         >Whose -He is the man.His mother is Lola.
                            *He is the man whose mother is Lola.
         >Which: -The dog is ill.The dog is in the vet.
                             *The dog which is in the vet is ill.
          >When: -1981 was a year.I was born.
                              *1981 was the year when I was born.
          >That: -He is the man.He eats with Pepa.
                              * He is the man that eats with Pepa.

!¡ Sometimes,the relative pronouns can be omitted if we have a subject in each clause.For example:
           > He is the man.I met yesterday.
                    *He is the man (who) I met yesterday  |Who can be omitted because of the underlined subject|

Another thing is that we can use THAT instead of using Who or Which,but only in defining relative clauses that we are going to explain the next day.For example:
             *He is the man WHO/THAT fights with Yeray.
             
             *The dog WHICH/THAT is in the vet is ill.