We make questions by:

1: moving an auxiliary to the front of the clause:

Everybody is watching    >>    Is everybody watching?   
They had worked hard    >>    Had they worked hard?   
He's finished work    >>    Has he finished work?   
Everybody had been working hard    >>    Had everybody been working hard?   
He has been singing    >>    Has he been singing?   
English is spoken all over the world    >>    Is English spoken all over the world?   
The windows have been cleaned    >>    Have the windows been cleaned?   

2: … or by moving a modal to the front of the clause:

They will come    >>    Will they come?   
He might come    >>    Might he come?   
They will have arrived by now    >>    Will they have arrived by now?   
She would have been listening    >>    Would she have been listening?   
The work will be finished soon    >>    Will the work be finished soon?   
They might have been invited to the party    >>    Might they have been invited to the party?   

3: The present simple and the past simple have no auxiliary. We make questions by adding the auxillary do/does for the present simple or did for the past simple:

They live here    >>    Do they live here?   
John lives here    >>    Does John live here?   
Everybody laughed    >>    Did everybody laugh?   

Exercise