Номер 4 я ничего не понимаю

1. I can't play marbles.
He/She can't play marbles.
2. I can ride on merry.
I can't ride on merry.
He/ She can't ride on merry.
3. I can sing English songs.
I can't sing English songs.
He/She can't sing English songs.
4. I can draw horses.
I can't draw horses.
He/She can't draw horses.
5. I can play computer games.
I can't play computer games.
He/She can't play computer games.