按要求完成句子。
1.It's my sister's dress.(对画线部分提问)
____________ dress ____________ it?
2.They are her sweaters.(对画线部分提问)
____________ sweaters ____________ they?
3.His trousers are white.(改为一般疑问句)
____________ ____________ trousers white?
4.Are those your coats? (作否定回答)
No, ____________ ____________.