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

第一句：
疑问句：DO they like hambrger?
否定句：They don't like hambrger.
肯定回答：Yes,they like hambrger.或者Yes,they like it.

第二句：
疑问句：Does she likes milk?
否定句：She doesn't like milk.
肯定回答：Yes,she likes milk.或者Yes,she like it.

第三句：
疑问句：DO I have a sister?否定句：I don't have a sister.
肯定回答：Yes,I have.或者Yes,I have a sister.

将原句改成疑问句的时候 一：观察原句，如They like hambrger.原句中没有谓语动词is/am/are，所以就用助动词do/does。 用助动词的时候注意第三人称单数。
二：和中文一样“我喜欢”——“I like”，“我不喜欢”——“I don't like”.注意第三人称单数。
三：肯定回答。先用Yes/no等词，表态。。同意还是反对。然后在加上不被肯定的内容就可以了。

加油吧！！！

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.

有实意动词的句子，将do或does提前，实意动词变原型，剩下按陈述句语序抄下就行了。

否定句：No I can't
疑问句：Can you going to the park?