The policeman heard a scream in the dark.The policeman didn't hear a scream in the dark.Did the policeman hear a scream in the dark?Mara saw a strange creature at the window.Mara didn't see a strange creature at the window.Did Mara see a strange creature at the window?Tom said something to his friend.Tom didn't say anything to his friend.Did Tom say anything to his friend?Ann had a scary feeling when the saw the empty house.Ann hadn't a scary feeling when she saw the empty house.Had Ann a scary feeling when she saw the empty house?The children came back late at night.The children didn't come back late at night.Did the children come back late at night?