She ate watermelon.
She didn't eat watermelon.
We had a birthday party last night.
We didn't have a birthday party last night.
I drank orange juice this morning.
I didn't drink orange juice.
I went to school yesterday.
I didn't go to school yesterday.
He danced last night.
He didn't dance last night.
He cried a lot yesterday.
He didn't cry a lot yesterday.