请问,how可以对介词短语提问,但有的介词短语我认为应用where提问比如on the desk,到底用什么,怎么区分

就地点介词短语划线提问用where,比如：This book is on the desk.（就on the desk划线提问）Where is this book?就方式程度介词短语划线提问用how,比如：I go to school by bike.（就by bik划线提问）How do you go ...