I am feeling very good today / Am I feeling very good today? I am not feeling very good today
He is upset / Is he upset? / He is not upset.
We are dancing . / Are we dancing? We are not dancing.
She is cooking now / Is she cooking now? She is not cooking now.
He is walking. / Is he walking? He is not walking.
Está ai... se não souber os verbos to be na forma contraída ai estao :
isn't e aren't o ``Am´´ não se junta ao ``not´´ apenas junta-se ao ``I,(eu)´´