Question

como ficam as formas negativas e interrogativas do S.P. ?

Answer 1

Forma negativa: sujeito, wasn´t ou was not/ weren´t ou were not + complemento. Exemplos: 
I wasn´t sick last week.
We weren´t worried yesterday.

Forma interrogativa: was/were + sujeito + complemento. Exemplos:
Was Ashley (she) in Canada last week?
Were Ashley and Ruan (they) worried about me?

Was/wasn´t: I, You, He, She, It.
Were/weren´t: We, You (plural), They.

Answer 2

Sujeito+verbo to be+not+objeto