Переделайте в отрицательные и вопросительные предложения, вот такие вот предложения: 1) a strange shape is moving across the sky 2) in his free time he tries to find out 3) some of our readers are thinking about up ufo

1. A strange shape isn't moving across the sky .(- )
Is a strange shape moving across the sky? ( ? )
2. Does he try to find out in his free time? ( ?)
He doesn't try to find out in his free time (- )
3. Are some of our readers thinking about up UFO? ( ?)
Some of our readers aren't thinking about up UFO. ( -)