He isn`t/ is not riding a bicycle
Is he riding a bicycle?
They aren`t/ are not listening to the radio.
Are they listening to the radio?
You aren`t/ are not dancing
Are you dancing?
She isn`t/ is not drinking Coke
Is she drinking Coke?
We aren`t playing basketball
Are we playing basketball?
I am not running
Am I running?
- poti folosi prescurtarile isn`t si aren`t sau formele lungi is not si are not, cum doresti de aceea am pus la fiecare doua variante :)