| When a yes/no question is changed to a sentence whether of if is used to intoduce the clause.
Example:
Yes/No question Reported Questions
Will she go? I don't know if/whether she will go.
Do you exercise? I don't remember if/whether I exercise.
Does she exercise? I don't know if/whether she exercises.
Did she exercise? I don't know if/whether she exercised.
| In a statement you cannot use question order. When making a reported questions the subject precedes the verb.
Notice: The auxiliary verbs do-does-did (used as auxiliaries) are deleted in a reported wh-question.
Question Reported question
aux. Sub Verb Sub Verb
Where does she go? I don't know where she goes.
What do you do? I can't remember what I do.
With the question word who the word order is the same in the question and in the reported question because WHO is the subject in both.
S V S V
Who ate ? I don't know who ate.
Who came? I don´t know who came.
Who is happy? I don't know who is happy.
If there is a subject in the question, this subject is placed in front of the verb be.
V S S V
Who is that man? I don´t know who that man is.
Who are they ? I don´t know who they are. | 
