Подскажите как написать правильно вопрос и отрицание к предложениям : 1) i have got a lot of good computer games. 2) it is late. 3)she can sing nice songs.

Have you got a lot of good computer games?
I haven't got a lot of good computer games.

Is it late?
It is not late.

Can she sing nice songs?
She can't sing nice songs.