1) Look! The children ARE PLAYING football in the sports ground.
(-) The children aren't playing football in the sports ground.
(?) Are the children playing football in the sports ground?
2) In the afternoon he usually PLAYS tennis in the park. I think you'll find him there.
(-) In the afternoon he doesn't usually play tennis in the park.
(?) Does he usually play tennis in the park in the afternoon?
1) Look! The children ARE PLAYING football in the sports ground.
(-) The children aren't playing football in the sports ground.
(?) Are the children playing football in the sports ground?
2) In the afternoon he usually PLAYS tennis in the park. I think you'll find him there.
(-) In the afternoon he doesn't usually play tennis in the park.
(?) Does he usually play tennis in the park in the afternoon?