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Shared knowledge
When we communicate with one another, without realising it, we depend
upon the fact that we share all sorts of background knowledge with our
interlocutors. So, if you want to tell someone about a wonderful meal
you had in a restaurant the previous evening, you are unlikely to begin
by telling them that the restaurant contained tables and chairs, that
you had to order your food before eating it, and so on. In other words,
you rely on the fact that your addressee shares with you quite a lot of
knowledge about restaurants, and you can therefore limit yourself to the
most interesting parts of your experience. Similarly, if you make a reference
to ‘my husband’ or ‘my wife’ in the course of
the conversation, you would expect your hearers to assume that you are
married, that you live with that person, and so on. In the majority of
the cases, we don't need to think consciously about the contribution of
shared knowledge to the success of our interactions with others.
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