в вопросительную и отрицательную форму . the  musicians are  performing. mary  is  drinking  cola.  the   clowns  are  holding  balloons, i m taking  pictures of  my   friends, you re feeling tired                                                                           

Are the  musicians  performing ?   the  musicians aren't  performing.

Is Mary drinking cola?   Mary isn't drinking cola.

Are the clowns holding balloons?   The clowns aren't holding balloons.

Are you taking pictures of your friends ?  You aren"t taking pictures of your friends.  (здесь вопрос задал к  YOU потому что нельзя задавать вопрос самому себе)

Are you feeling tired ?  You aren't feeling tired