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Non-Defining Relative Clauses |
Este es el tema de la lección 2 Unidad 4. |
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1. What is anon-defining relative clause?
A non-defining relative clause adds extra information about a person or thing.  Unlike defining relative clauses, the information isn't essential.  Compare the following:defining relative clause: What is the name of the person who won the Nobel Prize?

non-defining relative clause: Al Gore, who gave a  long and boring speech, won the Nobel Prize.

If theinformation from a non-defining relative clause gets removed, the sentence still makes sense.  (Al Gore won the Nobel Prize.)  This can't be said of defining relative clauses because the listener or readercan't understand to whom the first speaker is referring.  (What is the name of the person?  >>  Which person?!)

2. What is the sentence structure?
Commas usually offset non-defining relativeclauses, as do parenthesis or brackets.  The clauses may provide additional information on the subject or the object of a sentence, and with the following pronouns: RELATIVE PRONOUNS |   person |   thing |  place |
subject |   who |   which |   |
object |   who / whom |   which |   where |
possessive |   whose |   |   |

subject: subject  |  relative pronoun  |  non-defining clause  |  verb |  object/complement

Al Gore  |  who  |  won the Nobel Prize  |  gave  |  a long and boring speech.The Nobel Prize winner  |  who  |  had worked to fight global warming  |  gave  |  a long speech.object: subject  |  verb  |  object  |  relative pronoun  |  non-defining clause

Al Gore  |  gave  |  a speech  |  which  |  was boring.
Al Gore  |  won  |  the Nobel Prize  |  which  |  wasfor his fight against global warming.

3. How are non-defining relative clauses used?
Non-defining clauses are most often used in written English, or in more formal situations like speeches.  Here...