你的 老师 是谁. The emphasis is "who is YOUR teacher?" 谁是你的老师 The emphasis is "WHO is your teacher?"

在意义上，两句话没区别，一样。 在语法上，两句话不一样，区别很大：第一句主语是“你的老师”，“谁”是表语。第二句主语是“谁”，“你的老师”是表语。

They are almost the same, little difference. Like saying, "Who is your English teacher?" and "Your English teacher is (whom)?". Hope this will help!

你的老師是誰=maybe somebody ask you the question in anywhere 誰是你的老師means someone ask the question in front of your teacher.（maybe others looklike sanse.） 我也在學語言，英語，反過來翻譯應該對自己有幫助

There is no difference （I am chinese . I want to learn Engljsh.） we are friend ?