1、where did :Where did this accident happen is not clearly known. 2、what did :What did you say is very useful to finish this task. 3、did she :(这个貌似没法造主从吧) 4、how was :How was the weather is a common topic among people.
Where did you buy that book that our teacher recommended? What did you mean by giving the book that I do not have? Did she buy the book which is important for the exam? How was the book which I sent you last week?