小学英语,求详解,秒采纳!Q是变成疑问句,N是变成否定句

1Can he come now?When can he come?He can't come now
2Is there a newspaper on the desk?What is on the desk?There isn't a newspaper on the desk.
3Does he want a new car?What does he want?He doesn't want a new car.
4Is he going to come now?When is he going to come?He isn't going to come now.