For those of you who wish to revise relatives -especially if you are going to sit Certificación exam next June-, these resources here combine exercises from your textbook Open World (unit 6) with some other activities.
♠ Grammar presentation: Relative clauses
Watch the power point slides several times to revise relative structures and possibly learn new things about them.
♠ Open World. Grammar reference Unit 6, p. 217.
Read the brief explanation that reminds you of the difference between a defining and a non-defining relative clause, and then watch the Grammar on the Move video on p.87 -or the other way round, as you prefer-, before doing the two exercises on p.217. Note that in ex.2 n°4, the pronouns who/that can be omitted, as they are the object of the clause (this option is not in the key).
You can see the Grammar on the Move video through this link: http://www.cambridge.org/OW_First_Vid18
Go back to Relative clauses p.87 and do the exercises there, 1 to 5. Notice the use of whom, which you might not have come across with till now. In ex.4, sentence 5, both who and whom can be used with exactly the same meaning, being whom the most formal option. In exercise 5 you will practise some expressions with which and whom; in these phrases only whom is correct, but not who.
♠ Check out these links if you need to learn more about whom:
who vs whom: grammar rules whom: exercise 1 whom: exercise 2
♠ Here is a useful video about relatives, which I guess will help you:
Relatives: grammar lesson
♠ These are some extra exercises to practise relatives more in depth:
Relative clauses: rules+online exercises with answers
Stonehenge: relatives who/which -online exercise with answers
Relative pronoun: necessary or not? -online exercise with answers
Relative clauses: online test with answers
