如果是对话中问路的话,则：
Where's the post office?
= How can I go to the post office?
= Can/Could you (please) tell me how I can go to the post office?
= Which is the way to the post office?
= Can/Could you (please) tell me the way to the post office?
= Can/Could you (please) tell me which is the way to the post office?
注：/ 表示可以任意选用其一；（ ）表示可以省略不写.