1.My friends want to be policemen.
2.There is some ice cream in the box, isn't there?
3.Jane has never been to Boston.
4.You have never done the shopping in the evening,haven't you?
5. Have you ever been to Rostov?
6.Why are these children sleeping now?
7.We have heard the news.We know everything.
8.-Who goes to the stadium in the morning? -My sisters do. - если вы говорите о регулярных действиях (Кто ходит на стадион по утрам постоянно?)
Who is going to the stadium in the morning? -My sisters are. - если это одноразовое действие в будущем - !спорное предложение!