According to Prague School, a sentence contains a point of [填空1] and a goal of [填空2]. The former is equally present to the speaker and to the hearer,, the ground on which they meet, called [填空3]. The latter presents the very information that is to be imparted to the learner, called [填空4].
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Indeed, linguistic communication is not a static phenomenon but a dynamic one. Communicative [填空1]is meant to measure the amount of information an element carries in a source.
Normally in a sentence the [填空1]carries a lower degree of CD than other elements in a sentence.
With the direct and indirect objects, if they are contextually independent, the one coming later in a sentence carries a [填空1]degree of CD. Usually there is an indefinite article in front of each object.
According to Malinowski, the understanding of the meaning of the tribal language is related to the [填空1]. And the primitives see language as a sort of [填空2].