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We focus on the grammatical expression of four major groups of meanings related to knowledge: I. Evidentiality: grammatical expression of information source; II. Egophoricity: grammatical expression of access to knowledge; III. Mirativity: grammatical expression of expectation of knowledge; and IV. Epistemic modality: grammatical expression of attitude to knowledge. The four groups of categories interact. Some develop overtones of the others. Epistemic-directed evidentials have additional meanings typical of epistemic modalities, while egophoricity-directed evidentials combine some reference to access to knowledge by speaker and addressee. Over the past thirty years, new evidential choices have evolved among the Tariana – whose language has five evidential terms in an egophoricity-directed system – to reflect new ways of acquiring information, including radio, television, phone, and internet. Evidentials stand apart from other means of knowledge-related categories as tokens of language ecology corroborated by their sensitivity to the changing social environment. [ABSTRACT FROM AUTHOR]

Linguistic typology is an all-embracing discipline central for inductively-based cross-linguistic generalizations, supported by language facts. Firsthand investigation of previously undescribed languages from regions known for their linguistic diversity helps expand our knowledge about the nature of language and the parameters of cross-linguistic variation. We explore the options of marking commands in a non-main clause and the issue of associative non-singular number in Yalaku and in Manambu (from Papua New Guinea), before turning to nominal aspect and non-propositional evidentiality (exemplified with Tariana and Jarawara, from Brazilian Amazonia). Previously undescribed languages help typologists expand and test our analytic frameworks [ABSTRACT FROM AUTHOR]