поставить предложение в вопросительную и отрицательную форму there are children in the street; the cadet is at the desk; they get up at 7 o'clock; he wants to be a sailor

? Are there any children in the street?- There aren't any children in the street.

? Is the cadet  at the desk?- The cadet isn't at the deck.

? Do they get up at 7 o'clock?- They don't get up at 7. 

? Does he want to be a sailor?- He doesn't want to be a sailor.