1. Are the children reading the interesting book? - general question.
What are the children reading? - special question.
The children are reading the interesting book, aren't they? - tag/disjunctive question.
Are the children reading the interesting book or magazine? - alternative question.
Who is reading the interesting book? - question to the subject.
2. Will we be listening to Petrov at the concert? - general question.
Where will we be listening to Petrov? - special question.
We will be listening to Petrov at the concert, won't we? - tag/disjunctive question.
Will we be listening to Petrov or Ivanov at the concert? - alternative question.
Who will be listening to Petrov at the concert? - question to the subject.
3. Were we waiting for our friends? - general question.
Who were we waiting for - special question.
We were waiting for our friends, weren't we? - tag/disjunctive question.
Were we waiting for our friends or parents? - alternative question.
Who were waiting for our friends? - question to the subject.