1. who is decorating a new year tree now?
2. what is she decorating now?
3. when is she decorating new year tree now?
4. she is decorating new year tree, is not she?
1. who is watching a wonderful firework now?
2. what are they whatching now?
3. when are they watching a wonderful firework?
4. they are watching a wonderful firework, are not they?