1. Did they buy a few books. . . ?
They didn't buy a few. . .
2. Does my friend like big city?
My friend doesn't like our big city
3. Did he get marry last year?
He didn't get marry. .
4. Do little children eat candies. . . ?
Little children don't eat. . .
5. Are the students reading the text now?
The students aren't reading the text now
6. Did I be in London last year?
I didn't be in London last year.