英语怎么变疑问句,否定句,肯定回答. 如: they like hambrger. she likes milk. l

Do they like hamburger?
No,they don't.否定回答
They don't like hamburger.否定句
Does she like milk?
No,she doesn't
She doesn't like milk.
Do you have a sister?
No,I don't.
I don't have a sister.