"Can we buy all this in London?" Harry wondered aloud.
"If yeh know where to go," said Hagrid.
(Harry Potter and the Sorcerer's Stone)
The two of them already know they are going to London. Then what does ‘where’ mean?
"Can we buy all this in London?" Harry wondered aloud.
"If yeh know where to go," said Hagrid.
(Harry Potter and the Sorcerer's Stone)
The two of them already know they are going to London. Then what does ‘where’ mean?
What he is saying is: "If you know where to go in London to buy these things." For example, if you want to buy ingredients for a Chinese dish, you would go to Chinatown. If you didn't know where Chinatown was in London, then you would probably not find your ingredients.