This introductory chapter begins with a definition of adpositions (Adps) then reviews the current state of research on Adps. The book's scope and aims of the book, approach, argument, and intended readership are discussed. Adps do not always appear in the shortest types of sentences. Their knowledge and grammatical use are not acquired at an early stage of language-learning by children. However, Adps can be considered a fundamental part of speech because using lexemes only does not suffice to build a sentence, at least one which is recognized as complete and is not reduced to a one-word exclamation or interrogation. Certain tools are necessary to link lexemes to one another and to the whole sentence, thereby setting up dependency relationships.
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