French language Q&A Forum

Why "Je vais chez le boucher" and not "Je vais au boucher" when for going to boulangerie and marché, the answers are " je vais à la boulangerie" and "je peux aller au marché"? Are there certain places we need to use "chez" instead of  "à"?

For some reason I can't reply to a specific response, so I'll have to post this as a seperate comment. 

This is a follow up question to Laura's translation of "She ought to really stop seeing him", which she wrote as "Elle devrait vraiment arreter de le voir." I'm wondering if the phrase "Elle devrait vraiment s'arreter de le voir" is also acceptable.