When and time

"WHERE" AND "WHEN"

Where and a place

Where is used to ask a question about a place.
    Where will they go tomorrow?
    Where is my book?
    Where is the closest bus stop?

Where can be used to identify a place.
    This is the place where we will stand.
    He followed the men to the house where they were meeting.
    He will show the officer where the woman was hurt.

When and time

When is used to ask a question about time.
    When will we leave?
    When does the bus arrive?
    When did he finish his work?

When can be used to identify the time something happened.
    They were afraid when we left.
    We don't know when it will be finished.
    I need to leave when my car is fixed.