The boys are watching tv now.
The boys aren't watching tv now. (negativ)
Are the boys watching tv now? (interogativ)
The cat sleep every afternoon.
The cat isn't sleep every afternoon. (negativ)
It's cat sleep every afternoon? (interogativ)
Listen it's raining outside.
Listen it's not raining outside. (negativ)
It's raining outside? (interogativ)