“他们是谁”英语是who are they 还是who they are？

如果直接问，就是whu are they?

如果间接问：你知道他们是谁吗？那就是 do you know who they are?

who are they ?特殊疑问句，同who are you
who指那个人，假设为A，即为A are they.

英语中疑问句，一般系动词（be）、助动词（do）在主语前，为正常语序。 who are they 正确
有时也有表强烈情感，比如there you are！原来是你啊！ 表惊讶，语序倒装。

用作问句 是第一个
陈述句 是第二个

单独说就是who are they ？
复合句中用。。。。。。。+who they are

当然是who are they 疑问句需要倒装的 who they are 是用在从句中的 比如 I don;t know who they are. 我不知道他们是谁。 这是宾语从句。