An user English
says…

You
Pronoun
  can
Auxiliary
  be
Auxiliary
  sure
Adjective
  that
Subordinating conjunction
  they
Pronoun
  aren't   when
Adverb
  someone
Pronoun
  tells
Verb
  you
Pronoun
  they
Pronoun
  are
Auxiliary
  wise
Adjective
.

You can be sure that they aren't when someone tells you they are wise.

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