1) I've just read this article http://masteringarticles.com/object-activity-nouns/ and it says that "pub" is not a common activity noun, so when we say I want to go to the pub the word should be instead pluralized, rather than getting a the. However, I heard phrases like Right, let's go to the pub with no precursory reference to the pub. So, what's the right way to say? 2) I heard the phrase "in camp", though it's neither a common activity noun, nor something else. Why do we omit the article here?