hello
need to control some questions according to certain answers for example:
page 1
question 1.1
   Asdasd??

a. yes b. not

question 1.2
   Asdasd??

a. yes b. not

1.n question
   Asdasd??

a. yes b. not

page 2
question 2.1
  should be shown only if the question 1.1 was answered as "yes"

question 2.2
  should be shown only if the question 1.2 was answered as "yes"

anyone know how to do this, Thanks