He isn't dancing.
Incorrect
They aren't sleeping.
Correct
She is talking.
Incorrect
She is sleeping.
Correct
He is listening to music.
Correct
They aren't singing.
Correct
He isn't writing.
Incorrect
They are eating.
Correct
They aren't reading.
Correct
She is talking.
Correct
He is writing.
Correct
They aren't singing.
Correct
She is drawing.
Correct
They are playing.
Correct
She is drinking water.
Incorrect
They're doing homework.
Incorrect
He is singing.
Correct