She wasn't my friend.
Were you hot ?

 It was a good meal.
You were drinking some tea.

Were you drinking some water?

He was not play volleyball 
Was he play volleyball ??

she was playing chess
was he not play table tennis?

 was:I was not a student.
He was not tall in the past.
She was not absent from the class yesterday.
were:
We were not engineers.
They were not actors.
You were not professors.
Was(question):
Was he tall in the past?
Was she absent from the class yesterday?
Was you a student?(I)
Were(question):
Were they actors?
Were you professors?
Were they engineers?