How does William Shakespeare use disguise and deception to create action in Much Ado about Nothing?

Much Ado About Nothing is full of
duality, foils, doubles, and two-face
deceivers.

• In Act II, scene i there is a
  masquerade ball.  Don Pedro pretends to be Claudio and woo Hero for him.
  


• Beatrice pretends to be another woman when she talks to
  Benedick in order to find out his true feelings for
  her.


• Don John pretends to be a legitimate brother and
  soldier.  In reality, he is a villain and a bastard, a dispossessed
  son.


• Don John and Borachio talk to Claudio, knowing he
  will pretend to be Benedick in order to hear their
  secrets.


• Dogberry and the Watch pretend to be more ("more
  learned") than they really are.  Really, they are a bunch of
  clowns.


• Borachio woos Margaret but says Hero's name to
  deceive Claudio and Don Pedro.


• Ursula and Margaret bait
  Beatrice, saying that Benedick loves her.


• Don Pedro,
  Claudio, and Leonato bait Benedick, saying the Beatrice loves
  him.


• Leonato pretends that his daughter Hero is dead in
  order to investigate her slander.


• Hero pretends to be her
  sister in order to test Claudio at the
  wedding.