回答You don't know the girl with long hair,do you?_____.She is my cousin.

Yes

填No. 因为这是根据She is my cousin.这句话，说明我认识这个girl，从而对 You don't know the girl with long hair,进行不赞成的答复。翻译为“不。她是我的表妹。”
希望能帮到你，可以再问我啊~~

Yes,I do

Yes,I do.

Yes，i do. (不，我知道)
在回答前否后肯定的反义疑问句式，一定要根据实际情况回答，yes翻译成“不” no翻译成“是”。

You don't know the girl with long hair,do you?
Yes,I do(不，我知道)_____.She is my cousin.
这是反义疑问句特有的回答。

This house has a garden. I live in a house with a garden. The girl has long hair. Do you know the girl with long hair?= Do you know

You don't know the girl with long hair,do you?_No ,i know____.She is my cousin.

No.