sentence construction - Dropping "is" / "are" with dropping "that"

The word that is often dropped in an informal speech.

But what about dropping is and are? Consider the following examples:

1. 
   

   Examples that are not intended to be used in real documents: ...

   
   
   


2. 
   

   Examples are not intended to be used in real documents: ...

   
   


3. 
   

   Examples not intended to be used in real documents: ...

   
   

Are both 2 and 3 correct?