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Defining Vs Non-Defining Relative Clauses

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  • The cupboard where the electricity meter is located is locked.
    Defining - which cupboard is locked?
  • Solar power which is a form of renewable energy is very popular in Spain
    Non-defining - renewable energy is extra information
  • The people whose houses are near nuclear power stations understandably worry about radioactive leaks.
    Defining - does everyone worry about radioactive leaks?
  • Wind turbines which are located offshore are more expensive than wind turbines which are located on top of hills.
    Defining - here you can change the "which" to "that"
  • People who criticize nuclear power should consult the facts.
    Defining - which people should 'consult the facts'?
  • Ethanol which is a type of biofuel is made from the sugar is certain crops.
    Non-defining - the type of energy is extra info.
  • Enrico Fermi who first split the atom is often considered to be the inventor of nuclear power
    Non-defining - what he did is extra info.
  • Al Gore who is a key supporter of alternative energy won the Nobel Prize in 2007.
    Non-defining - what he supports is extra info
  • There are certain solar panels that can produce almost a kilowatt of energy per day.
    Defining - you need everything after "that"
  • Nuclear power stations which have poor safety records should be closed down.
    Defining - not all power stations should be closed down
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