Составьте на английском языке по 3 предложения в пассивной конструкции (утвердительные, во отрицателные

The house was built by my grandfather.
This cake is being baked by my mum.
The tickets were bought by my parents.
(Утвердительные)
The book hasn’t already been discussed.
Homework isn’t being done by my brother.
This present wasn’t given to me by my friend.
(Отрицательные)
Are you invited to the party?
Is the letter sent?
Was he helped by you?
(вопросительные)