• Relative Clauses

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• Relative clauses* are added to main clauses to provide additional information that is necessary to understand the meaning of the sentence. Relative clauses begin with a relative pronoun or relative adverb.

  
  

  The apartment that Sam bought is near public transportation.
  

  (There are many apartments near public transportation, the relative clause that Sam bought shows a specific apartment.)
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• They want an apartment that is pet friendly.	He's the man to whom I sold my house.
  That's the house where Jack grew up.	The architecture is why we want to buy this house.

• *Remember! There are two types of clauses: dependent and independent.  A relative clause is a type of dependent clause because it cannot function as a sentence by itself.

Source : Alison