Ex. Aff She was playing the piano./ They were playing the piano.

Ex.Int Was she playing the piano? / Were they playing the piano?

Ex.Neg She wasn´t playing the piano. / They weren´t playing the piano.

Ex. Aff She played the piano./ They played the piano.

Ex.Int Did she play the piano? / Did they play the piano?

Ex.Neg she didn´t play the piano. / They didn´t play the piano.

Ex. Aff She had played the piano./ They had played the piano.

Ex.Int Had she played the piano? / Had they played the piano?

Ex.Neg She hadn´t played the piano. / They hadn´t played the piano.

Ex. Aff She had been playing the piano./ They had been playing the piano.

Ex.Int Had she been playing the piano? / Had they been playing the piano?

Ex.Neg She hadn´t been playing the piano. / They hadn´t been playing the piano.