This chapter focuses on the interaction between pre-suppositions and implicatures triggered by factive verbs. It is concerned with cognitive factives, which is the class of factive verbs used primarily to indicate what information the subject has or how information is acquired or lost. Members of this class in English include know, realize, discover, notice, recognize, find out, remember, forget, aware, unaware, admit, intuit, and a subclass of sensory factives sense, see, smell, hear, detect, observe. The chapter considers naturally occurring data. It consists of examples occurring on world wide web located using Google search engine. The logic behind using internet rather than a more structured linguistic corpus is simple: first, author's goal is to show existence proofs; second, there is a huge difference of scale. In many cases the patterns author has searched for are quite rare, and existing linguistic corpora are not large enough to be useful. Keywords: cognitive factives; factive verbs; implicatures; linguistic corpus; sensory factives; world wide web
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