___your ___subject?

What's your favorite subject?

What is your subject?

what's favourite

What's favorite

根据前后语句才能回答的吧

你把整句话贴上来呢？
是要问你最喜欢哪门课程的话？
What's your favourite subject？

是要问你主要的课程的话？
What's your major subject?