have sth.in mind和think of有什么区别?

还有What's on your mind?
这个相当于 What are you thinking?
你是怎么想的?
think of 想起
Have you thought of anything?你想起什么没有?
Do you have anything in mind?你是不是已经有想法（主意）了
后一句：比如,你已经知道答案了,歌者知道该怎么做某事了