Where did you play basketball?
Where did you go?
When it comes to "where", one of the question words, I know we don't put a preposition at the end because "where", I think, is a kind of adverb. At least, I have never heard
Where did you play basketball at?
Where did you go to?
In other cases, like "what" or "which", we can say
What did you do this for?
Which boy did you play games with?
However, I encountered one strange sentence on the net and is wondering why it is correct.
Where did you break in to?(I found it on grammar girl
Shouldn't it be "where did you break in"?
Grammar girl website(where I found the sentence): http://www.quickanddirtytips.com/education/grammar/in-to-or-into?page=1
Where are you from?
Maybe I sound stupid, but I am curious about why the "from" can be there.