It is not a banana.
It isn't a banana.
No, it is not.
No, it isn't.
They are not animals.
They aren't animals.
Her hair is not straight.
Her hair isn't straight.
This is not a yogurt.
This isn't a yogurt.
I do not like juice.
I don't like juice.
It is not his house.
It isn't his house.
I do not go to school today.
I don't go to school today.
No, they are not.
No, they aren't.
They are not ice creams.
They aren't ice creams.
I do not have any ideas.
I don't have any ideas.
I do not like ice cream but I like apple juice.
I don't like ice cream but I like apple juice.
Those are not bikes.
Those aren't bikes.
I do not like carrots.
I don't like carrots.