Question

They+are+both+my+good+friends+.如何改为一般疑问句并做出肯定和否定回？

Answer 1

这句话是主系表句子，谓语动词是are，改一般疑问句，把are提到句首，Are they both your good friends?肯定回答Yes，they are.No，they aren't.

Answer 2

Are they both your good friends?
Yes, they are./No, they aren't.

Answer 3

They are both my good friend，这句话的意思是，他们两个都是我的好朋友，主语是第三人称，复数动词用的是系动词，后面形容词性物主代词用的是我的mine，所以变一般疑问句的时候，需要变成your你的这个句子的一般疑问句就是
Are they both your good
friends？

Answer 4

改为一般疑问句：A re they both your good friends? 肯定：yes they are . 否定：they aren't.

Answer 5

一般疑问句:Are they both your good friends？
肯定回答:Yes,they are.
否定回答:No,they aren't.