Indirect questions are dependent clauses that are often preceded by

==>  an introductory clause such as:

  Wissen Sie / Weißt du / Wisst ihr, . . .
  Können Sie mir sagen, . . .
  Ich möchte wissen, . . .
  Darf ich fragen,

or ==> clauses that introduce who asked what:

  Helga fragt Karl, . . .
 

There are two forms of indirect questions
These forms depend on the structure of the question:

 1.)  Information =>  Interrogative as Conjunction

        Questions that begin with an interrogative (question word) like:
 
 

    Questions  that ask for information are formulated:  Interrogative + Verb + Subject [+rest of sentence]?

    The interrogative essentially functions as a subordinating conjunction;  the verb is at the end of the clause.
 

                 MODELL:   Wohin geht Frank?

                    ==>    Ich möchte wissen, wohin Frank geht.
 
 
 

 2.)  Ja/Nein Questions  =>  use "ob"
 

    Ja/nein questions are formulated thus:   Verb + Subject + [rest of the sentence]?

    Here, you must use the conjunction "ob" [whether or not] to link the two sentences:

 
                MODELL:   Kommst du mit?
 
                    ==>    Wir wollen wissen, ob du mitkommst.