I want a stamp.否定句

I want a stamp.否定句 I've got a Chinese stamp.改为否定句 I want a stamp.对a stamp 提问 大明 has got a stamp from china.变否定句 英语的问题I have a friend 改成否定句和第三人称单数 There is a stamp show on s I want to have a picnic tomorrow.(改为否定句) I want to buy a new dictionary.(改为否定句) i want to have a picnic tomorrow 改成否定句 I want to buy a backpack.(改为否定句) I want a pair of sneakers.【怎么改成否定句】 I WANT TO BUY A NEW BOOK .改为否定句 i want a new walkman.改否定句